Musnad Ahmad 987:5

Muhammad ibn Mus'ab narrated to us, al-Awza'i narrated to us, from Yahya ibn Abi Kathir, from Abu Salamah, from Ja'far ibn 'Amr ibn Umayyah al-Damri, from his father, who said: "I saw the Messenger of Allah, peace and blessings of Allah be upon him, wiping over the khuffayn (leather socks) and the khimar (head covering)."