From Sahih Bukhari (Hadith 1697):
Narrated Hafsa:I said, "O Allah's Messenger (ﷺ)! What is wrong with the people, they have finished their Ihram but you have not?" He said, "I matted my hair and I have garlanded my Hadi, so I will not finish my Ihram till I have finished my Hajj
Reference: Bukhari 1697