Musnad Abu Ya'la al-Mawsili 140:36

Ishaq ibn Abi Isra'il narrated to us, Hajjaj narrated to us, from al-Rabi' ibn Sabih, Yazid al-Raqashi narrated to us, from Anas ibn Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The son of Adam will be brought on the Day of Resurrection as if he were a lamb—and perhaps he said: as if he were a camel—and the son of Adam will say: 'I am the best of those who divide.' Look at your deed which you did for Me, for I shall reward you for it. And look at your deed which you did for other than Me, so let him reward you for whom you did it."