Sunan Ibn Majah, Book 24, Hadith 2923 (In-Book) ⓘ

It was narrated that Harith bin Hassan said: “I came to Al-Madinah and saw the Prophet standing on the pulpit, and Bilal standing in front of him, with his sword by his side, and (I saw) a black flag. I said: ‘Who is this?’ He said: ‘This is ‘Amr bin ‘As, who has just come back from a campaign.’”

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو بَكْرِ بْنُ عَيَّاشٍ، عَنْ عَاصِمٍ، عَنِ الْحَارِثِ بْنِ حَسَّانَ، قَالَ قَدِمْتُ الْمَدِينَةَ فَرَأَيْتُ النَّبِيَّ صلى الله عليه وسلم قَائِمًا عَلَى الْمِنْبَرِ وَبِلاَلٌ قَائِمٌ بَيْنَ يَدَيْهِ مُتَقَلِّدٌ سَيْفًا وَإِذَا رَايَةٌ سَوْدَاءُ فَقُلْتُ مَنْ هَذَا قَالُوا هَذَا عَمْرُو بْنُ الْعَاصِ قَدِمَ مِنْ غَزَاةٍ ‏.‏