The sahabi who was killed while praying was Ali ibn Abi Talib.
Ali ibn Abi Talib, the fourth Rashidun Caliph and a central figure in Shia Islam, was assassinated during the morning (Fajr) prayer on 19 Ramadan, 40 AH (corresponding to January 28, 661 CE). He was attacked by a Kharijite assassin, Abd-al-Rahman ibn Muljam, while leading the prayer in the Great Mosque of Kufa. The assassination marked a significant event in early Islamic history, contributing to the subsequent political divisions within the Muslim community.
