Musnad Abu Ya'la al-Mawsili 237:10

Abu Hammam narrated to us, he said: Ismail narrated to me, from Safwan bin Amr, from Abd al-Rahman bin Jubayr bin Nufayr, from his father, from Khalid bin 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).