Musannaf Ibn Abi Shayba 8:1930

Abu Bakr narrated to us, he said: Abu Khalid al-Ahmar narrated to us, from Ibn Jurayj, from Muhammad ibn al-Harith, from Sufyan, from Abu al-Azdi, who said: Ibn Umar slaughtered [his sacrificial animal] and shaved [his head]. He said: So I heard him saying to the barber, "Reach the bones." He said: I heard them mentioning it, but I did not hear it from Thabit.