The Sahifa Sajjadiyya is a compilation of supplicatory prayers ascribed to the fourth Imam of the Shi?a, ?Ali b. al-Husayn al-Sajjad (d. 94/712-13 0r 95/713-14). Alternatively referred to as the 'psalms' (zabur) or the 'gospels' (injil) of the family of the Prophet, the Sahifa Sajjadiyya ranks among the holiest books of the Shi?a, together with the Qur?an and ?Ali b. Abi Talib's Nahj al-balagha. Al-Sajjad was known for his piety and for his being given to prayer. Yet it is more likely that the Sahifa is a later compilation of prayers attributed to him. The Sahifa published here in facsimile is the 'complete' (kamila) recension ascribed to Ibn Makki (d. 786/1384) in a copy made just five years after Makki's death, together with an early interlinear Persian translation. Apart from the orthographical and linguistic points of interest of this manuscript, its early dating may throw light on the history of transmission of Ibn Makki's recension.