Musannaf Ibn Abi Shayba 3:5863

Abu Mu'awiyah and Ibn Numayr narrated to us, from al-A'mash, from 'Umarah ibn 'Umayr, from 'Abd al-Rahman ibn Yazid, from 'Abdullah, who said: I did not see the Messenger of Allah (may Allah bless him and grant him peace) pray any prayer except at its time, except for the Maghrib and Isha, for he combined them that day at Jam' (Muzdalifah), and he prayed the Fajr that day before its [usual] time.