Musnad Ahmad 30:1653

Husayn ibn Muhammad narrated to us, Muslim—meaning Ibn Khalid—narrated to us, from al-Ala’ ibn Abd al-Rahman, from his father, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, that he said: "The nobility of a man is his religion, his chivalry is his intellect, and his honor is his character."