Muhammad b. Musa b. al-Mutawakkil narrated to us. He said: `Ali b. al-Husayn al-Sa`d al-Abidi narrated to us from Ahmad b. Abi `Abdullah al-Barqi from `Abd al-Athim b. `Abdullah al-Hasani from Muhammad b. `Ali b. Musa b. Ja`far b. Muhammad b. `Ali b. al-Husayn b. `Ali b. Abi Talib from his father . He said:

Musa b. Ja`far visited Harun al-Rashid, and he eased his anger against a man. So, he said to him: Only get angry for the sake of Allah. Do not get angrier on His behalf than He gets for Himself.