Musnad Abu Ya'la al-Mawsili 148:81

Abu Bakr ibn Abi Shaybah narrated to us, Abdullah ibn Numayr narrated to us, from Sa’d ibn Sa’id, who said: Anas ibn Malik narrated to me, he said: Abu Talhah sent me to the Messenger of Allah (may Allah bless him and grant him peace) to invite him, and he had prepared food for him. He said: So I approached, and the Messenger of Allah (may Allah bless him and grant him peace) was with the people. He said: He looked at me, and I felt shy, so I said: "Answer Abu Talhah." He said to the people: "Stand up." Abu Talhah said: "O Messenger of Allah, I only prepared a little for you." He said: So the Messenger of Allah (may Allah bless him and grant him peace) touched it and prayed for blessing in it. He said: "Let in a group of my companions, ten." He said: "Eat." And he brought out for them something from between his fingers, and they ate until they were full and left. He continued to let in ten and let out ten until no one remained among them except that he had entered and eaten until he was full. He said: Then he prepared it, and behold, it was the same as it was when they ate from it.