Musnad Ahmad 3870

It was narrated that 'Abdur-Rahman bin Yazeed said: We performed Hajj with Ibn Mas'ood (رضي الله عنه) during the caliphate of 'Uthman. When we stood in ‘Arafah, when the sun set, Ibn Mas'ood (رضي الله عنه) said: If Ameer al Mu'mineen moves on now, he will have done the right thing. He said: I do not know which came first, the words of Ibn Mas'ood (رضي الله عنه) or 'Uthman's moving on. The people rushed, but Ibn Masood moved at a measured pace until we came to Muzdalifah. Ibn Mas'ood led us in praying Maghrib, then he called for his supper and ate his supper, then he got up and prayed Isha'. Then he went to sleep until, when dawn first broke, he got up and prayed Fajr. I said to him: You do not usually pray at this hour! - he said: he used to pray when it got very light - and he said: I saw the Messenger of Allah (ﷺ) on this day, in this place, praying at this hour.