Sunan Abi dawud:1784 Chapter: The Obligation of Hajj Book 11, Hadith 64

A’ishah reported the Apostle of Allaah(ﷺ) as saying “If I had known beforehand about my affair what I have come to know later, I would not have brought the sacrificial animals with me. The narrator Muhammad(bin Yahya) said “ I think he(’Uthman bin ‘Umar) said and I would have taken off my ihram with those who have put their ihram after performing ‘Umrah. He said “By this he intended that all the people might have performed equal rites(of Hajj)