In the time of the Messenger of Allah ﷺ an army got food and honey and a fifth was not taken from them.  

أَنَّ جَيْشًا غَنِمُوا فِي زَمَانِ رَسُولِ اللَّهِ ﷺ طَعَامًا وَعَسَلاً فَلَمْ يُؤْخَذْ مِنْهُمُ الْخُمُسُ  

‘Abd Allaah bin Mughaffal said “On the day of Khaibar a skin of fat was hanging. I came to it and clung to it. I then said (i.e., thought) I shall not give any one any of it today. I then turned round and saw the Apostle of Allaah ﷺ smiling at me.  

ثُمَّ قُلْتُ لاَ أُعْطِي مِنْ هَذَا أَحَدًا الْيَوْمَ شَيْئًا قَالَ فَالْتَفَتُّ فَإِذَا رَسُولُ اللَّهِ ﷺ يَتَبَسَّمُ إِلَىَّ