It was narrated that Abu Hamra' said:
"I saw the Messenger of Allah (ﷺ) pass by a man having food in a vessel. He put his hand in it and said: 'Perhaps you are cheating. Whoever cheats us is not one of us."' (IT)
English reference (IT): Vol. 3, Book 12, Hadith 2225 (IT)
Arabic reference (IT): Book 12, Hadith 2310 (IT)