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Сочинение средневекового сирийского книжника в пересказе арабоязычного копта-энциклопедиста
Mağmū‘ uṣūl ad-dīn wa-masmū‘ maḥṣūl al-yaqīn ("Summa of the foundations of religion and what has been heard of reliable knowledge") – a comprehensive treatise of Mu’taman ibn al-‘Assāl, a Coptic author of the 13th century, contains a synopsis of the "Book of the concordance in faith" (section 4 of the eighth chapter of the "Summa"). The author of the "Book" is there indefinitely referred to as "Elias, Metropolitan of Jerusalem,.. and also it was said that he was ‘Alī ibn Dāūd". The "Book" is known in two recensions, and its textual history is discussed in the article, so that the author of the work has been undoubtedly defined. The discussed treatise is a work of an ecumenically minded author on the main denominations of Eastern Christianity.