Musannaf Ibn Abi Shayba 28:806

Abu Dawud al-Tayalisi narrated to us, from Shu'bah, from Humayd ibn Hilal, from Abdullah ibn Mughaffal, who said: I heard him saying: A leather bag of fat was lowered to me on the day of Khaybar. He said: So I embraced it and said, "This is for me; I will not give anyone anything from it." Then the Prophet, may Allah bless him and grant him peace, turned toward me, smiling, and I felt ashamed.