Musannaf Ibn Abi Shaybah 35364 — Those who permitted burning in enemy

Suwayd bin Ghafalah (may Allah have mercy on him) said: Sayyiduna Ali (may Allah be pleased with him) burned heretics (zanadiqah) in the market. When fire was thrown upon them, he (may Allah be pleased with him) said: Allah and His Messenger (peace and blessings be upon him) have spoken the truth. Then he (may Allah be pleased with him) went back, and I followed behind him. He (may Allah be pleased with him) turned towards me and asked: Is that Suwayd? I said: Yes. I said: O Commander of the Faithful, I heard you saying something? He (may Allah be pleased with him) said: O Suwayd, I am among ignorant people. So when you hear me say that the Messenger of Allah (peace and blessings be upon him) said something, then it is absolutely true.