From Sahih Muslim (Hadith 4605):
It has been narrated on the authority of Abdullah b. Mughaffal who said I found a bag containing fat on the day of the Battle of Khaibar. I caught hold of it and said:I will not give anything today from it to anybody. Then I turned round and saw that the Messenger of Allah (ﷺ) was smiling (at my words)
Reference: Muslim 4605