Muhammad ibn AbulMujahid reported Abdullah ibn AbuAwfa as saying: I asked: Did you set aside the fifth of the food in the time of the Messenger of Allah ﷺ? He replied: On the day of Khaybar we captured food and a man would come and take as much food of it as needed and then go away. (Using translation from Abū Dāʾūd 2704)
قُلْتُ هَلْ كُنْتُمْ تُخَمِّسُونَ الطَّعَامَ فِي عَهْدِ رَسُولِ اللَّهِ ﷺ؟ فَقَالَ «أَصَبْنَا طَعَامًا يَوْمَ خَيْبَرَ وَكَانَ الرَّجُلُ يَجِيءُ فَيَأْخُذُ مِنْهُ بِمِقْدَارِ مَا يَكْفِيهِ ثُمَّ يَنْصَرِفُ»