Ibn 'Abbas (RA) 'is reported to have said: The Messenger of Allah (ﷺ) put on Ihigm for Hajj. When four days of Dhu'l-Hijja were over, he led the dawn prayer, and when the prayer was complete, he said: He who wants to change it to 'Umrah may do so.
Hadith ReferenceSahih Muslim / The Book of Pilgrimage / Hadith: 1240