It is narrated from Ali bin Abi Talhah that we performed Hajj and passed by Sayyiduna Hasan bin Ali (may Allah be pleased with them both) in Madinah, and Mu'awiyah bin Hudayj was with us. It was said to Sayyiduna Hasan: This is Mu'awiyah bin Hudayj, who reviles Sayyiduna Ali. He said: "Bring him to me." When he was brought, he asked: "Do you revile Ali?" He said: "I have not done so." He said: "By Allah! If you meet him, and I do not think you will be able to meet him on the Day of Resurrection, you will find him standing at the Pond of the Messenger of Allah (peace and blessings be upon him), driving the banners of the hypocrites away from it with a staff of boxthorn ('awsaj) in his hand. The truthful one, the one confirmed as truthful (peace and blessings be upon him), told me this; and whoever fabricates lies has indeed failed." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.