From Sahih Muslim (Hadith 3023):
Abu Sa'id (Allah be pleased with him) reported:We went out with Allah's messenger (ﷺ) pronouncing loudly the Talbiya for Hajj When we came to Mecca, he commanded us that we should change this (Ihram for Hajj) to that of Umra except one who had brought the sacrificial animal with him. When it was the day of Tarwiya (8th of Dhul-Hijja) and we went to Mini, we (again) pronounced Talbiya for Hajj
Reference: Muslim 3023