Musnad Ahmad 30:3798

'Affan narrated to us, Aban narrated to us, Yahya ibn Abi Kathir narrated to us, Abu Salamah ibn 'Abd al-Rahman narrated to us, from Abu Hurairah: That the Prophet of Allah, may Allah bless him and grant him peace, said: "The believer is jealous." And he mentioned the like of it.