Musannaf Ibn Abi Shayba 16:735

Abu Bakr narrated to us, he said: Ubaydullah narrated to us, he said: Musa ibn Ubaydah narrated to us, from Abdullah ibn Dinar, from Ibn Umar, that the Prophet, may Allah bless him and grant him peace, entered Makkah on the day of the Conquest, and upon him was a black turban.