Musnad Ahmad 28:159

Hassan narrated to us, Ibn Lahi'ah narrated to us, Darraj narrated to us, from Abd al-Rahman ibn Jubayr, from Abdullah ibn Amr, that he asked the Messenger of Allah, may Allah bless him and grant him peace: "What distances me from the anger of Allah, the Almighty and Majestic?" He said: "Do not become angry."