Hazrat Amr bin Hubshi (may Allah have mercy on him) narrates that Hazrat Hasan bin Ali (may Allah be pleased with him) addressed us after the demise of Hazrat Ali (may Allah be pleased with him): Indeed, yesterday that person has departed from you whose knowledge the people before him could not attain, nor will those after him be able to attain. The Messenger of Allah (peace and blessings be upon him) used to grant him the flag, and he would not return until Allah Almighty granted him victory.