Musannaf Ibn Abi Shaybah 34264 — The virtues of Ali bin Abi Talib

Abdullah bin Shaddad said: A delegation of the Sarh tribe of Yemen came to the Messenger of Allah (peace and blessings be upon him), and the Messenger of Allah (peace and blessings be upon him) said to them: "You must certainly establish the prayer and pay the zakah, and listen and obey, or else I shall send to you a man who is like myself. He will fight those of you who fight, and he will take your offspring captive. O Allah, it is I or one like myself." Then he (peace and blessings be upon him) took the hand of Sayyiduna Ali (may Allah be pleased with him).