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."' (TR)
English reference (TR): Vol. 3, Book 12, Hadith 2225 (TR)
Arabic reference (TR): Book 12, Hadith 2310 (TR)