Musannaf Ibn Abi Shaybah 34294 — The virtues of Ali bin Abi Talib

Abu Bakr bin Khalid bin Urfutah (may Allah have mercy on him) said: I came to Sayyiduna Sa'd bin Malik (may Allah be pleased with him) in Madinah, and he said: "It has been mentioned to me that you people curse Sayyiduna Ali (may Allah be pleased with him)." I said: "Yes, we have done so." He asked: "Perhaps you too curse him?" I said: "I seek refuge with Allah!" He said: "Never curse him. Even if a saw were placed on the middle of my head so that I curse Sayyiduna Ali (may Allah be pleased with him), I would never curse him, after hearing the hadith that I have heard from the Messenger of Allah (peace and blessings be upon him)."