Musnad Ahmad 30:3604

Sulayman narrated to us, Harb and Aban narrated to us, from Yahya ibn Abi Kathir, Abu Salamah narrated to me, that Abu Hurairah informed him that the Messenger of Allah, peace and blessings of Allah be upon him, said: "Indeed, Allah the Almighty and Majestic is jealous, and the believer is jealous. And the jealousy of Allah is that the believer commits what He has forbidden for him."