Al-Sahifa al-Sajjadiyya (الصحيفة السجادية) is said to be the oldest prayer manual in Islamic sources and one of the most seminal works of Islamic spirituality of the early period. It is also known as Sahifa-e-Kamila, Sister of the Qur'an, Gospel of the Folk of the House, and Psalms of the Household of Muhammad.

There is multiple versions of al-Sahifa al-Sajjadiyya, one such version transmitted by Zaydi Shi'a sources, differentiating itself from the twelver Shi'a version in that it does not transmit as many supplications as were gradually accepted into the mainstream version. The version authenticated by twelver scholars contains fifty-four main supplications along with the addenda which was appended to the text by Shams al-Din Muhammad ibn Makki. Fifteen munajat were also "added to several modern editions of the Sahifa and seem to have been brought to the attention of the main body of Shi'ites by `Allama Muhammad Baqir Majlisi (d. 1110/1689-9 or a year later), author of the monumental compilation of Shi'ite hadith, Bihar al-Anwar." Furthermore, a host of other supplications were later attributed to Zayn al-'Abidin as well and are recorded in separate collections named as the second Sahifa, third Sahifa and so on: