We came with Allah's Messenger (ﷺ) (to Mecca) and we were saying: 'Labbaika Allahumma Labbaik' for Hajj. Allah's Messenger (ﷺ) ordered us to perform `Umra with that Ihram (instead of Hajj).
Sahih al-Bukhari Book 25, Hadith 56
← Previous Hadith `Ali and `Uthman differed regarding Hajj-at-Tamattu` while they were at 'Usfan (a familiar place near Mecca). `Ali said, "I see you want to forbid people to do a thing that the Prophet (ﷺ) did?" When `Ali saw that, he assumed Ihram for both Hajj and `Umra.

Sahih al-Bukhari Book 25, Hadith 55 Next Hadith → We performed Hajj-at-Tamattu` in the lifetime of Allah's Messenger (ﷺ) and then the Qur'an was revealed (regarding Hajj-at-Tamattu`) and somebody said what he wished (regarding Hajj-at-Tamattu`) according his own opinion.

Sahih al-Bukhari Book 25, Hadith 57