It was narrated that Harith bin Hassan said:
“I came to Al-Madinah and saw the Prophet ﷺ 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 ﷺ قَائِمًا عَلَى الْمِنْبَرِ وَبِلاَلٌ قَائِمٌ بَيْنَ يَدَيْهِ مُتَقَلِّدٌ سَيْفًا وَإِذَا رَايَةٌ سَوْدَاءُ فَقُلْتُ مَنْ هَذَا قَالُوا هَذَا عَمْرُو بْنُ الْعَاصِ قَدِمَ مِنْ غَزَاةٍ .