The significance of the Assurance is discussed by early Muslim historians such as al-Waqidi (c. 747–823), al-Baladhuri (d. 892), in addition to Ibn al-Athir (1160-1232/3) and Abu al-Fida’ (1273-1331). The text of the document is included, either abridged or as long text, in the works al-Ya'qubi (d. 897/8), Eutychius (877–940), al-Tabari (copied from Sayf ibn Umar (died betw. 786-809), al-Himyari, Mujir al-Din al-Hanbali, and Ibn al-Jawzi (c. 1116–1201).
