Musannaf Ibn Abi Shaybah 35851 — The black banners

Sayyiduna al-Harith bin Hassan (may Allah be pleased with him) said: I came to Madinah, and the Prophet (peace and blessings be upon him) was seated on the pulpit, and Sayyiduna Bilal (may Allah be pleased with him) was standing before him with a sword hanging from his shoulder. Suddenly black banners appeared, and I asked: Who are these? The people told me: Sayyiduna Amr bin al-As (may Allah be pleased with him) has returned from a battle.