The Messenger of Allah ﷺ entered the state of ihram for hajj.
أخبرنا قتيبة عن مالك عن أبي الأسود محمد بن عبد الرحمن عن عروة بن الزبير
أهل رسول الله ﷺ بالحج
No references are available.
Bukhari narrated it in Hajj, the chapter on Tamattu, Qiran, and Ifrad in Hajj, etc., no. 1562, and Muslim, no. 1211/118 (see the previous hadith from the hadith of Malik through this same route, and it is in Muwatta (Yahya) 1/335), and Kubra, no. 3696, from Muhammad bin Abdul-Rahman bin Nawfal.