حَدَّثَنَا الْوَلِيدُ بْنُ عُتْبَةَ، حَدَّثَنَا الْوَلِيدُ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ الْعَلاَءِ، أَنَّهُ سَمِعَ أَبَا سَلاَّمٍ الأَسْوَدَ، قَالَ سَمِعْتُ عَمْرَو بْنَ عَبَسَةَ، قَالَ صَلَّى بِنَا رَسُولُ اللَّهِ صلى الله عليه وسلم إِلَى بَعِيرٍ مِنَ الْمَغْنَمِ فَلَمَّا سَلَّمَ أَخَذَ وَبَرَةً مِنْ جَنْبِ الْبَعِيرِ ثُمَّ قَالَ ‏"‏وَلاَ يَحِلُّ لِي مِنْ غَنَائِمِكُمْ مِثْلُ هَذَا إِلاَّ الْخُمُسَ وَالْخُمُسُ مَرْدُودٌ فِيكُمْ ‏"
Translation
Narrated Amr ibn Abasah

The Messenger of Allah (ﷺ) led us in prayer facing a camel from the spoils of war. When he had given the salutation, he took a hair from the camel's side, then said: "Nothing is lawful for me from your spoils of war, not even as much as this, except the fifth, and the fifth is returned to you."