Musnad Abu Ya'la al-Mawsili 54:15

Abu Abdullah Ahmad ibn Ibrahim narrated to us, Abu Abd al-Rahman narrated to us, Sa'id narrated to us, Abu Marhum narrated to me, from Sahl ibn Mu'adh ibn Anas, from his father, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever suppresses his rage while he is capable of executing it, Allah will call him before the heads of all creation on the Day of Resurrection, so that He may let him choose whichever of the houris he wishes."