Musannaf Ibn Abi Shayba 13:2688

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Al-A’mash narrated to us, from Al-Musayyab ibn Rafi’, he said: They used to enter upon Alqamah while he was tending to his sheep, meaning he was letting the billy goat mount them, feeding them, and milking them.