There was a mention of the so-called "fatwa" of Mardin made by Ibn Taymiyya al-Harrani. Note that the fatwa in its entirety is invalid, mostly because Ibn Taymiyya himself was known as a heterodox and weak individual. Imam Ibn Hajar writes in al-Fatawa al-Hadithiyya :
" Ibn Taymiyya is a servant which Allah forsook, misguided, blinded, deafened, and debased. That is the declaration of the imams who have exposed the corruption of his positions and the mendacity of his sayings. Whoever wishes to pursue this must read the words of the mujtahid imam Abu al-Hasan (Taqi al-Din) al-Subki, of his son Taj al-Din Subki, of the Imam al-`Izz ibn Jama`a and others of the Shafi`i, Maliki, and Hanafi shaykhs... It must be considered that he is a misguided and misguiding innovator (mubtadi` dall mudill) and an ignorant who brought evil (jahilun ghalun) whom Allah treated with His justice. May He protect us from the likes of his path, doctrine, and actions !... Know that he has differed from people on questions about which Taj al-Din Ibn al-Subki and others warned us."
To add to this, even the members of the Wahhabi sect, such as Rabi` ibn Hadi al-Madhkhali, agree that Ibn Taymiyya is not an authority, when he says :
"I didn’t find this hadith and I am afraid that Shaykh ul-Islam [Ibn Taymiyya]’s mind has gone to the other hadith of Abu Hurayra (ra), that says "Allah has angels wandering on earth, in addition to what is in the record of deeds of the people ; and when they find a group remembering Allah, they call each other ’come unto what you desired’ and they come. And they surround them until the lowest sky. Allahs says, ’what were My servants doing when you left them ?’ They say, ’we left them thanking You, praising You and remembering You.’..." Imam Ahmad, 2/251, Tirmidhi 5/579, 130 Chapter of what has been narrated regarding what Allah has wandering angels on earth. Tirmidhi said the hadith is hasanan sahih, #3600, and Ad-Darimi 2/225, hadith #2777"
Of course, this is by the member of Ibn Taymiyya’s own sect, who called him weak. Amongst the most staunchest of those who called Ibn Taymiyya to have disbelieved is Imam Zahid al-Kawthari, may Allah have mercy upon him, who states in his "al-Maqalat" :
" In al-Ta’sis fi Radd Asas al-Taqdis ("The Laying of the Foundation : A Refutation of al-Razi’s "The Foundation of Allah’s Sanctification") Ibn Taymiyya says : "Al-`arsh (the throne) in language means al-sarir (elevated seat or couch), so named with respect to what is on top of it, just as the roof is so named with respect to what is under it. Therefore, if the Qur’an attributes a throne to Allah, it is then known that this throne is, with respect to Allah, like the elevated seat is with respect to other than Allah. This makes it necessarily true that He is on top of the throne." So then the throne is, for Ibn Taymiyya, Allah’s seat (maq`ad)- Exalted is He from such a notion ! "
Ibn Taymiyya is also well noted for his aberrant and heretodox opinions. The following is a listed from Imam Ibn Hajar’s al-Fatawa al-Hadithiya of many of Ibn Taymiyya’s wrong opinions :
1. that whoso violates the consensus commits neither disbelief (kufr) nor grave transgression (fisq) ;
2. that our Lord is subject to created events (mahallun li al-hawadith) - glorified, exalted, and sanctified is He far above what the depraved ascribe to Him !
3. that He is complex or made of parts (murakkab), His Entity standing in need similarly to the way the whole stands in need of the parts, elevated is He and sanctified above that !
4. that the Qur’an is created in Allah’s Entity (muhdath fi dhatillah), elevated is He above that !
5. that the world is of a pre-eternal nature and exists with Allah since pre-eternity as an "ever-abiding created object" (makhluqan da’iman), thus making it necessarily existent in His Entity (mujaban bi al-dhat) and not acting deliberately[GH1] (la fa`ilan bi al-ikhtyar), elevated is He above that !12
6. his suggestions of Allah’s corporeality, direction, displacement, (al-jismiyya wa al-jiha wa al-intiqal), and that He fits the size of the Throne, being neither bigger nor smaller, exalted is He from such a hideous invention and wide-open disbelief, and may He forsake all his followers, and may all his beliefs be scattered and lost !
7. his saying that the fire shall go out (al-nar tafni),13
8. and that Prophets are not sinless (al-anbiya’ ghayr ma`sumin),
9. and that the Prophet — Allah bless and greet him — has no special status before Allah (la jaha lahu) and must not be used as a means (la yutawassalu bihi),14
10. and that the undertaking of travel (al-safar) to the Prophet — Allah bless and greet him — in order to perform his visitation is a sin, for which it is unlawful to shorten the prayers,15 and that it is forbidden to ask for his intercession in view of the Day of Need,
11. and that the words (alfaz) of the Torah and the Gospel were not substituted, but their meanings (ma`ani) were.
Some said : "Whoever looks at his books does not attribute to him most of these positions, except that whereby he holds the view that Allah has a direction, and that he authored a book to establish this, and forces the proof upon the people who follow this school of thought that they are believers in Allah’s corporeality (jismiyya), dimensionality (muhadhat), and settledness (istiqrar)." That is, it may be that at times he used to assert these proofs and that they were consequently attributed to him in particular. But whoever attributed this to him from among the imams of Islam upon whose greatness, leadership, religion, trustworthiness, fairness, acceptance, insight, and meticulousness there is agreement - then they do not say anything except what has been duly established with added precautions and repeated inquiry. This is especially true when a Muslim is attributed a view which necessitates his disbelief, apostasy, misguidance, and execution. Therefore if it is true of him that he is a disbeliever and an innovator, then Allah will deal with him with His justice, and other than that He will forgive us and him"
Also, even Sulayman ibn Sahman has listed 53 issues where Ibn Taymiyya has gone against the 4 Imams.
Ibn Taymiyya’s so-called "fatwa" is thus invalid, un-applicable, and against the authority of the `ulema of Ahl al-Sunnah and even the Wahhabis (who are heterodox and deviant) recognize Ibn Taymiyya’s heterodoxy.
And Allah and His Messenger Knows Best