Musnad Ahmad 26:848

Hassan ibn Musa narrated to us, Zuhair narrated to us, Abu Ishaq narrated to us, he said: I heard Abd al-Rahman ibn Yazid say: Abdullah ibn Mas’ud performed Hajj, and Alqamah ordered me to accompany him, so I accompanied him and I was with him. He mentioned the hadith. When the dawn appeared, he said: "Perform the Iqamah." I said: "O Abu Abd al-Rahman, this is a time at which I have never seen you pray?" He said: "The Messenger of Allah (peace and blessings of Allah be upon him) would not pray at this time except for this prayer, in this place, on this day." Abdullah said: "They are two prayers that are shifted from their times: the Maghrib prayer after the people arrive at Muzdalifah, and the morning prayer when the dawn breaks." He said: "I saw the Messenger of Allah (peace and blessings of Allah be upon him) do that."