Musnad Ahmad 1119:19

Abu al-Mughirah narrated to us, he said: Safwan ibn 'Amr narrated to us, he said: 'Abd al-Rahman ibn Jubayr ibn Nufayr narrated to me, from his father, from 'Awf ibn Malik al-Ashja'i and Khalid ibn al-Walid, "that the Prophet, peace and blessings of Allah be upon him, did not take the fifth (khums) of the spoils of war (salab)."