Musnad Ahmad 819:3

Mu'tamir narrated to us, he said: I heard Ibn Abi al-Hakam al-Ghifari saying: My grandmother narrated to me, from my father's paternal uncle: Rafi' ibn 'Amr al-Ghifari, who said: I was a young boy throwing stones at the palm trees of the Ansar. I was brought to the Prophet, peace and blessings of Allah be upon him, and it was said: "There is a boy here throwing stones at our palm trees." I was brought to the Prophet, peace and blessings of Allah be upon him, and he said: "O boy, why do you throw stones at the palm trees?" I said: "I eat [from them]." He said: "Do not throw stones at the palm trees, and eat what falls at their bases." Then he wiped my head and said: "O Allah, fill his stomach."