Sunni Ulema warnings on the Najdi Satanic Fitna.  These Ulema are from Saudi Arabia, Morocco, Syria, Egypt, Turkey, Iraq etc

Al-Ahsa'i Al-Misri, Ahmad (1753-1826): Unpublished manuscript of a refutation of the Wahhabi sect. His son Shaykh Muhammad ibn Ahmad ibn `Abd al-Latif al-Ahsa'i also wrote a book refuting them.

Al-Ahsa'i, Al-Sayyid `Abd al-Rahman: wrote a sixty-seven verse poem which begins with the verse:

Badat fitnatun kal layli qad ghattatil aafaaqa
wa sha``at fa kadat tublighul gharba wash sharaqa

[A confusion came about like nightfall covering the skies
and became widespread almost reaching the whole world]

Al-`Amrawi, `Abd al-Hayy, and `Abd al-Hakim Murad (Qarawiyyin University, Morocco): Al-tahdhir min al-ightirar bi ma ja'a fi kitab al-hiwar ["Warning Against Being Fooled By the Contents of the Book (by Ibn Mani`) A Debate With al-Maliki (an attack on Ibn `Alawi al-Maliki by a Wahhabi writer)"] (Fes: Qarawiyyin, 1984).

`Ata' Allah al-Makki: al-sarim al-hindi fil `unuq al-najdi ["The Indian Scimitar on the Najdi's Neck"].

Al-Azhari, `Abd Rabbih ibn Sulayman al-Shafi`i (The author of Sharh Jami' al-Usul li ahadith al-Rasul, a basic book of Usul al-Fiqh: Fayd al-Wahhab fi Bayan Ahl al-Haqq wa man dalla `an al-sawab, 4 vols. ["Allah's Outpouring in Differentiating the True Muslims From Those Who Deviated From the Truth"].

Al-`Azzami, `Allama al-shaykh Salama (d. 1379H): Al-Barahin al-sati`at ["The Radiant Proofs..."].

Al-Barakat al-Shafi`i al-Ahmadi al-Makki, `Abd al-Wahhab ibn Ahmad: unpublished manuscript of a refutation of the Wahhabi sect.

al-Bulaqi, Mustafa al-Masri wrote a refutation to San`a'i's poem in which the latter had praised Ibn `Abd al-Wahhab. It is in Samnudi's "Sa`adat al-Darayn" and consists in 126 verses beginning thus:

Bi hamdi wali al-hamdi la al-dhammi astabdi
Wa bil haqqi la bil khalqi lil haqqi astahdi

[By the glory of the Owner of glory, not baseness, do I overcome;
And by Allah, not by creatures, do I seek guidance to Allah]

Al-Buti, Dr. Muhammad Sa`id Ramadan (University of Damascus): Al-Salafiyyatu marhalatun zamaniyyatun mubarakatun la madhhabun islami ["The Salafiyya is a blessed historical period not an Islamic school of law"] (Damascus: Dar al-fikr, 1988); Al-lamadhhabiyya akhtaru bid`atin tuhaddidu al-shari`a al-islamiyya ["Non-madhhabism is the most dangerous innovation presently menacing Islamic law"] (Damascus: Maktabat al-Farabi, n.d.).

Al-Dahesh ibn `Abd Allah, Dr. (Arab University of Morocco), ed. Munazara `ilmiyya bayna `Ali ibn Muhammad al-Sharif wa al-Imam Ahmad ibn Idris fi al-radd `ala Wahhabiyyat Najd, Tihama, wa `Asir ["Scholarly Debate Between the Sharif and Ahmad ibn Idris Against the Wahhabis of Najd, Tihama, and `Asir"].

Dahlan, al-Sayyid Ahmad ibn Zayni (d. 1304/1886). Mufti of Mecca and Shaykh al-Islam (highest religious authority in the Ottoman jurisdiction) for the Hijaz region: al-Durar al-saniyyah fi al-radd ala al-Wahhabiyyah ["The Pure Pearls in Answering the Wahhabis"] pub. Egypt 1319 & 1347 H; Fitnat al-Wahhabiyyah ["The Wahhabi Fitna"]; Khulasat al-Kalam fi bayan Umara' al-Balad al-Haram ["The Summation Concerning the Leaders of the Sacrosanct Country"], a history of the Wahhabi fitna in Najd and the Hijaz.

al-Dajwi, Hamd Allah: al-Basa'ir li Munkiri al-tawassul ka amthal Muhd. Ibn `Abdul Wahhab ["The Evident Proofs Against Those Who Deny the Seeking of Intercession Like Muhammad Ibn `Abdul Wahhab"].

Shaykh al-Islam Dawud ibn Sulayman al-Baghdadi al-Hanafi (1815-1881 CE): al-Minha al-Wahbiyya fi radd al-Wahhabiyya ["The Divine Dispensation Concerning the Wahhabi Deviation"]; Ashadd al-Jihad fi Ibtal Da`wa al-Ijtihad ["The Most Violent Jihad in Proving False Those Who Falsely Claim Ijtihad"].

Al-Falani al-Maghribi, al-Muhaddith Salih: authored a large volume collating the answers of scholars of the Four Schools to Muhammad ibn `Abd al-Wahhab.

al-Habibi, Muhammad `Ashiq al-Rahman: `Adhab Allah al-Mujdi li Junun al-Munkir al-Najdi ["Allah's Terrible Punishment for the Mad Rejector From Najd"].

Al-Haddad, al-Sayyid al-`Alawi ibn Ahmad ibn Hasan ibn al-Qutb
Sayyidi `Abd Allah ibn `Alawi al-Haddad al-Shafi`i: al-Sayf al-batir li `unq al-munkir `ala al-akabir ["The Sharp Sword for the Neck of the Assailant of Great Scholars"]. Unpublished manuscript of about 100 folios; Misbah al-anam wa jala' al-zalam fi radd shubah al-bid`i al-najdi al-lati adalla biha al-`awamm ["The Lamp of Mankind and the Illumination of Darkness Concerning the Refutation of the Errors of the Innovator From Najd by Which He Had Misled the Common People"]. Published 1325H.

Al-Hamami al-Misri, Shaykh Mustafa: Ghawth al-`ibad bi bayan al-rashad ["The Helper of Allah's Servants According to the Affirmation of Guidance"].

Al-Hilmi al-Qadiri al-Iskandari, Shaykh Ibrahim: Jalal al-haqq fi kashf ahwal ashrar al-khalq ["The Splendor of Truth in Exposing the Worst of People] (pub. 1355H).

Al-Husayni, `Amili, Muhsin (1865-1952). Kashf al-irtiyab fi atba` Muhammad ibn `Abd al-Wahhab ["The Dispelling of Doubt Concerning the Followers of Muhammad ibn `Abd al-Wahhab"]. [Yemen?]: Maktabat al-Yaman al-Kubra, 198?.

Al-Kabbani, Muhammad Hisham, Encyclopedia of Islamic Doctrine, vol. 1-7, As-Sunnah Foundation of America, 1998.
Islamic Beliefs and Doctrine According to Ahl as-Sunna - A Repudiation of "Salafi" Innovations, ASFA, 1996.
Innovation and True Belief: the Celebration of Mawlid According to the Qur'an and Sunna and the Scholars of Islam, ASFA, 1995.
Salafi Movement Unveiled, ASFA, 1997.

Ibn `Abd al-Latif al-Shafi`i, `Abd Allah: Tajrid sayf al-jihad `ala mudda`i al-ijtihad ["The drawing of the sword of jihad against the false claimants to ijtihad"].

The family of Ibn `Abd al-Razzaq al-Hanbali in Zubara and Bahrayn possess both manuscript and printed refutations by scholars of the Four Schools from Mecca, Madina, al-Ahsa', al-Basra, Baghdad, Aleppo, Yemen and other Islamic regions.

Ibn `Abd al-Wahhab al-Najdi, `Allama al-Shaykh Sulayman, elder brother of Muhammad ibn `Abd al-Wahhab: al-Sawa'iq al-Ilahiyya fi al-radd 'ala al-Wahhabiyya ["Divine Lightnings in Answering the Wahhabis"]. Ed. Ibrahim Muhammad al-Batawi. Cairo: Dar al-insan, 1987. Offset reprint by Waqf Ikhlas, Istanbul: Hakikat Kitabevi, 1994. Prefaces by Shaykh Muhammad ibn Sulayman al-Kurdi al-Shafi`i and Shaykh Muhammad Hayyan al-Sindi (Muhammad Ibn `Abd al-Wahhab's shaykh) to the effect that Ibn `Abd al-Wahhab is "dall mudill" ("misguided and misguiding").

Ibn `Abidin al-Hanafi, al-Sayyid Muhammad Amin: Radd al-muhtar `ala al-durr al-mukhtar, Vol. 3, Kitab al-Iman, Bab al-bughat ["Answer to the Perplexed: A Commentary on "The Chosen Pearl,"" Book of Belief, Chapter on Rebels]. Cairo: Dar al-Tiba`a al-Misriyya, 1272 H.

Ibn `Afaliq al-Hanbali, Muhammad Ibn `Abdul Rahman: Tahakkum al-muqallidin bi man idda`a tajdid al-din [Sarcasm of the muqallids against the false claimants to the Renewal of Religion]. A very comprehensive book refuting the Wahhabi heresy and posting questions which Ibn `Abdul Wahhab and his followers were unable to answer for the most part.

Ibn Dawud al-Hanbali, `Afif al-Din `Abd Allah: as-sawa`iq wa al-ru`ud ["Lightnings and thunder"], a very important book in 20 chapters. According to the Mufti of Yemen Shaykh al-`Alawi ibn Ahmad al-Haddad, the mufti of Yemen, "This book has received the approval of the `ulama of Basra, Baghdad, Aleppo, and Ahsa' [Arabian peninsula]. It was summarized by Muhammad ibn Bashir the qadi of Ra's al-Khayma in Oman."

Ibn Ghalbun al-Libi also wrote a refutation in forty verses of al-San`ani's poem in which the latter had praised Ibn `Abd al-Wahhab. It is in Samnudi's Sa`adat al-darayn and begins thus:
Salami `ala ahlil isabati wal-rushdi
Wa laysa `ala najdi wa man halla fi najdi

[My salutation is upon the people of truth and guidance
And not upon Najd nor the one who settled in Najd]

Ibn Khalifa `Ulyawi al-Azhari: Hadhihi `aqidatu al-salaf wa al-khalaf fi dhat Allahi ta`ala wa sifatihi wa af`alihi wa al-jawab al-sahih li ma waqa`a fihi al-khilaf min al-furu` bayna al-da`in li al-Salafiyya wa atba` al-madhahib al-arba`a al-islamiyya ["This is the doctrine of the Predecessors and the Descendants concerning the divergences in the branches between those who call to al-Salafiyya and the followers of the Four Islamic Schools of Law"] (Damascus: Matba`at Zayd ibn Thabit, 1398/1977.

Kawthari al-Hanafi, Muhammad Zahid. Maqalat al-Kawthari. (Cairo: al-Maktabah al-Azhariyah li al-Turath, 1994).

Al-Kawwash al-Tunisi, `Allama Al-Shaykh Salih: his refutation of the Wahhabi sect is contained in Samnudi's volume: "Sa`adat al-darayn fi al-radd `ala al-firqatayn."

Khazbek, Shaykh Hasan: Al-maqalat al-wafiyyat fi al-radd `ala al-wahhabiyyah ["Complete Treatise in Refuting the Wahhabis"].

Makhluf, Muhammad Hasanayn: Risalat fi hukm al-tawassul bil-anbiya wal-awliya ["Treatise on the Ruling Concerning the Use of Prophets and Saints as Intermediaries"].

Al-Maliki al-Husayni, Al-muhaddith Muhammad al-Hasan ibn `Alawi: Mafahimu yajibu an tusahhah ["Notions that should be corrected"] 4th ed. (Dubai: Hashr ibn Muhammad Dalmuk, 1986); Muhammad al-insanu al-kamil ["Muhammad, the Perfect Human Being"] 3rd ed. (Jeddah: Dar al-Shuruq, 1404/1984).

Al-Mashrifi al-Maliki al-Jaza'iri: Izhar al-`uquq mimman mana`a al-tawassul bil nabi wa al-wali al-saduq ["The Exposure of the Disobedience of Those Who Forbid Using the Intermediary of the Prophets and the Truthful Saints].

Al-Mirghani al-Ta'ifi, `Allama `Abd Allah ibn Ibrahim (d. 1793): Tahrid al-aghbiya' `ala al-Istighatha bil-anbiya' wal-awliya ["The Provocations of the Ignorant Against Seeking the Help of Prophets and Saints"] (Cairo: al-Halabi, 1939).

Mu'in al-Haqq al-Dehlawi (d. 1289): Sayf al-Jabbar al-maslul `ala a`da' al-Abrar ["The Sword of the Almighty Drawn Against the Enemies of the Pure Ones"].

Al-Muwaysi al-Yamani, `Abd Allah ibn `Isa: Unpublished manuscript of a refutation of the Wahhabi sect.

Al-Nabahani al-Shafi`i, al-qadi al-muhaddith Yusuf ibn Isma`il (1850-1932): Shawahid al-Haqq fi al-istighatha bi sayyid al-Khalq (s) ["The Proofs of Truth in the Seeking of the Intercession of the Prophet"].

Al-Qabbani al-Basri al-Shafi`i, Allama Ahmad ibn `Ali: A manuscript treatise in approximately 10 chapters.

Al-Qadumi al-Nabulusi al-Hanbali: `AbdAllah: Rihlat ["Journey"].

Al-Qazwini, Muhammad Hasan, (d. 1825). Al-Barahin al-jaliyyah fi raf` tashkikat al-Wahhabiyah ["The Plain Demonstrations That Dispel the Aspersions of the Wahhabis"]. Ed. Muhammad Munir al-Husayni al-Milani. 1st ed. Beirut: Mu'assasat al-Wafa', 1987.

Al-Qudsi: al-Suyuf al-Siqal fi A`naq man ankara `ala al-awliya ba`d al-intiqal ["The Burnished Swords on the Necks of Those Who Deny the Role of Saints After Their Leaving This World"].

Al-Rifa`i, Yusuf al-Sayyid Hashim, President of the World Union of Islamic Propagation and Information: Adillat Ahl al-Sunna wa al-Jama`at aw al-radd al-muhkam al-mani` `ala munkarat wa shubuhat Ibn Mani` fi tahajjumihi `ala al-sayyid Muhammad `Alawi al-Maliki al-Makki ["The Proofs of the People of the Way of the Prophet and the Muslim Community: or, the Strong and Decisive Refutation of Ibn Mani`'s Aberrations and Aspersions in his Assault on Muhammad `Alawi al-Maliki al-Makki"] (Kuwait: Dar al-siyasa, 1984).

Al-Samnudi al-Mansuri, al-`Allama al-Shaykh Ibrahim: Sa`adat al-darayn fi al-radd `ala al-firqatayn al-wahhabiyya wa muqallidat al-zahiriyyah ["Bliss in the Two Abodes: Refutation of the Two Sects, Wahhabis and Zahiri Followers"].

Al-Saqqaf al-Shafi`i, Hasan ibn `Ali, Islamic Research Intitute, Amman, Jordan: al-Ighatha bi adillat al-istighatha wa al-radd al-mubin `ala munkiri al-tawassul ["The Mercy of Allah in the Proofs of Seeking Intercession and the Clear Answer to Those who Reject it"]; Ilqam al hajar li al-mutatawil `ala al-Asha`ira min al-Bashar ["The Stoning of All Those Who Attack Ash'aris"]; Qamus shata'im al-Albani wa al-alfaz al-munkara al-lati yatluquha fi haqq ulama al-ummah wa fudalai'ha wa ghayrihim... ["Encyclopedia of al-Albani's Abhorrent Expressions Which He Uses Against the Scholars of the Community, its Eminent Men, and Others..."] Amman : Dar al-Imam al-Nawawi, 1993.

Al-Sawi al-Misri: Hashiyat `ala al-jalalayn ["Commentary on the Tafsir of the Two Jalal al-Din"].
Sayf al-Din Ahmed ibn Muhammad: Al-Albani Unveiled: An Exposition of His Errors and Other Important Issues, 2nd ed. (London: s.n., 1994).

Al-Shatti al-Athari al-Hanbali, al-Sayyid Mustafa ibn Ahmad ibn Hasan, Mufti of Syria: al-Nuqul al-shar'iyyah fi al-radd 'ala al-Wahhabiyya ["The Legal Proofs in Answering the Wahhabis"].

Al-Subki, al-hafiz Taqi al-Din (d. 756/1355): Al-durra al-mudiyya fi al-radd `ala Ibn Taymiyya, ed. Muhammad Zahid al-Kawthari ["The Luminous Pearl: A Refutation of Ibn Taymiyya"]; Al-rasa'il al-subkiyya fi al-radd `ala Ibn Taymiyya wa tilmidhihi Ibn Qayyim al-Jawziyya, ed. Kamal al-Hut ["Subki's treatises in Answer to Ibn Taymiyya and his pupil Ibn Qayyim al-Jawziyya"] (Beirut: `Alam al-Kutub, 1983); Al-sayf al-saqil fi al-radd `ala Ibn Zafil ["The Burnished Sword in Refuting Ibn Zafil (Ibn Qayyim al-Jawziyya)" Cairo: Matba`at al-Sa`ada, 1937; Shifa' al-siqam fi ziyarat khayr al-anam ["The healing of the sick in visiting the Best of Creation"].

Sunbul al-Hanafi al-Ta'ifi, Allama Tahir: Sima al-Intisar lil awliya' al-abrar ["The Mark of Victory Belongs to Allah's Pure Friends"].

Al-Tabataba'i al-Basri, al-Sayyid: also wrote a reply to San`a'i's poem which was excerpted in Samnudi's Sa`adat al-Darayn. After reading it, San`a'i reversed his position and said: "I have repented from what I said concerning the Najdi."

Al-Tamimi al-Maliki, `Allama Isma`il (d. 1248), Shaykh al-Islam in Tunis: wrote a refutation of a treatise of Ibn `Abd al-Wahhab.

Al-Wazzani, al-Shaykh al-Mahdi, Mufti of Fes, Morocco: Wrote a refutation of Muhammad `Abduh's prohibition of tawassul.

al-Zahawi al-Baghdadi, Jamil Effendi Sidqi (d. 1355/1936): al-Fajr al-Sadiq fi al-radd 'ala munkiri al-tawassul wa al-khawariq ["The True Dawn in Refuting Those Who Deny the Seeking of Intercession and the Miracles of Saints"] Pub. 1323/1905 in Egypt.

Al-Zamzami al-Shafi`i, Muhammad Salih, Imam of the Maqam Ibrahim in Mecca, wrote a book in 20 chapters against them according to al-Sayyid al-Haddad.
See also:

Ahmad, Qeyamuddin. The Wahhabi movement in India. 2nd rev. ed. New Delhi : Manohar, 1994.