Musannaf Ibn Abi Shaybah 34477 — Abu Masud al-Ansari

Abd al-Aziz bin Rufay' (may Allah have mercy on him) said: When Sayyiduna Ali (may Allah be pleased with him) was setting out for the battle of Siffin, he appointed Sayyiduna Abu Mas'ud (may Allah be pleased with him) as his deputy over the people. When Sayyiduna Ali (may Allah be pleased with him) returned, he said to him: "Are you the one who said what has reached me from you, O Farrukh? You are an old man, and your mind has certainly gone." He (may Allah be pleased with him) said: "Has my mind gone, when Paradise has become binding for me for the sake of Allah and His Messenger (peace and blessings be upon him)? You know this."