Maliks Muwatta Book 20, Hadith Number 38.
Section : Doing Hajj on its Own.
Yahya related to me from Malik, from Abu’l-Aswad Muhammad ibn ‘Abd ar-Rahman, from Urwa ibn az-Zubayr, from A’isha, umm al-muminin, that the Messenger of Allah, may Allah bless him and grant him peace, did hajj on its own.