Jami` at-Tirmidhi 3274

Narrated Abu Wa'il:that Al-Harith bin Yazid Al-Bakri said: "I arrived in Al-Madinah and entered the Masjid and found it full with the people and I also noticed a black banner raised high, while Bilal was holding a sword before the Messenger of Allah (ﷺ). I said: 'What is the matter with the people?' They said: 'He intends to send 'Amr bin Al-'As somewhere.'" So he mentioned the Hadith in its entirety, similar in meaning to the narration of Sufyan bin 'Uyainah (#3273). He said: He is also called Al-Harith bin Hassan