It is narrated from Sayyiduna Harith bin Hissan Bakri, may Allah be pleased with him, who says: We came to Madinah Munawwarah and saw that the Messenger of Allah, peace and blessings be upon him, was seated on the pulpit. Sayyiduna Bilal, may Allah be pleased with him, was standing before him holding a sword, and several black flags were visible. I asked: What are these flags? They said: Sayyiduna Amr bin Aas, may Allah be pleased with him, has returned from a battle.