Musnad Ahmad 32:1931

Rawh narrated to us, Shu'bah narrated to us, from Qatadah, who said: I heard Anas narrating from the Prophet, peace and blessings of Allah be upon him, that he said: "None of you believes until he loves for the people what he loves for himself, and until a man loves [another] person, not loving him except for the sake of Allah."