Asas al-Taqdis (Arabic: أساس التقديس, lit. 'The Foundation of Declaring Allah's Transcendence'), also known as Ta'sis al-Taqdis (Arabic: تأسيس التقديس, lit. 'The Establishment of the Sacred') is an Islamic theological book, written by the Shafi'i-Ash'ari scholar Fakhr al-Din al-Razi (d. 606/1209), as a methodical refutation of the Karramiyya and other anthropomorphists.
Al-Razi actually wrote this work to counter the book Kitab al-Tawhid composed by the traditionalist Ibn Khuzayma in 4th/10th century Nisapur against the prevailing Mu'tazilite dogma. He referred to Ibn Khuzayma as 'the corporealist' (al-mujassim).
He said in the book's introduction that he dedicated it especially to the Sultan Abu Bakr ibn Ayyub.
The first part of the book opens with a categorical rejection of any corporeality regarding God, under the title of "Indications on God's Transcendence beyond Corporeality and on Him not Being Confined [by any spatial location]". That is, in fact, his definition of anthropomorphism: al-Razi maintains that the one God is not present in a direction; He is not a space-occupying entity and is not a body, an assertion for which he provides proofs based on rational and textual evidence.
Al-Razi raises numerous claims, which he then refutes. The claims he contradicts are namely those held by the corporealist Karramites and the ultra-traditionalists who affirmed God's direction (jiha) and its veridical meaning (as haqiqa: truth, reality). In his discussion al-Razi articulates the Mu'tazilite stance on this matter and explains the proper figurative interpretation (ta'wil), according to his opinion.
Ibn Taymiyya (d. 728/1328) and his student Ibn Qayyim (d. 751/1350) criticized and attacked it. Ibn Taymiyya attacked it in a book entitled al-Ta'sis fi Radd Asas al-Taqdis (Arabic: التأسيس في رد أساس التقديس), better known as Bayan Talbis al-Jahmiyya (Arabic: بيان تلبيس الجهمية, lit. 'Explication of the Deceit of the Jahmiyya').