Al-Sahifa al-Sajadiya is a book filled with supplications from our 4th Imam, Imam Ali son of Hussain son of Ali son of Abu Talib may Allah's peace and blessings be upon them all. In his supplications, Imam Ali Al-Sajjad used to teach his Shias different teachings that have to do with their religion, their current life and the after-life as he speaks with Allah (swt).