Musannaf Ibn Abi Shayba 1:1868

Affan narrated to us, he said: Hammad bin Salamah narrated to us, he said: Ayyub narrated to us, from Abu Qilabah, from Abu Idris, from Bilal, he said: I saw the Messenger of Allah (may Allah bless him and grant him peace) wiping over the leather socks (al-muqayn) and the head covering (al-khimar).