Musannaf Ibn Abi Shaybah 40652 — reports on Siffin

Sa'd bin Ibrahim said: Sayyiduna Ali (may Allah be pleased with him) was holding the hand of Sayyiduna Adi bin Hatim (may Allah be pleased with him) and passing among the slain when he passed by a man. I recognised him and said: "O Commander of the Believers, when I last knew this man he was a believer." He said: "And now as well."