Habeerah narrates that once, while delivering a sermon before us, Sayyiduna Imam Hasan (may Allah be pleased with him) said: "Yesterday, a person has departed from you such that those before him could not surpass him in knowledge, and those after him will not even reach the dust of his feet. The Prophet (peace and blessings be upon him) used to send him with his banner; Jibreel (peace be upon him) would be on his right side and Mikaeel (peace be upon him) on his left, and he would not return without achieving victory."