Musnad Abu Ya'la al-Mawsili 115:342

Abu Musa narrated to us, Muhammad bin Ja'far narrated to us, Shu'bah narrated to us, he said: I heard Qatadah narrating from Anas bin Malik, from the Prophet (peace be upon him), he said: "None of you believes until he loves for his brother and for his neighbor what he loves for himself."