Chapter 16: The Book of Pilgrimage
A' bdullah (b. 'Umar) reported: I have never seen Allah' s Messenger, (ﷺ) but observing the prayers at their appointed times except two prayers, sunset and 'Isha, 'at Muzdalifa (where he deferred the sunset prayer to combine it with 'Isha' and he observed the dawn prayer before its stipulated time on that day (10th of Dhu' l-Hijja).
Sahih Muslim 1289a