(5) باب صفة الحج ودخول مكة
Whenever Ibn 'Umar (RAA) came to Makkah he would spend the night at Dhi Tuwa valley (near Makkah), and in the morning he would bathe. 'Ibn 'Umar used to say that this is what the Messenger of Allah (ﷺ), used to do.' Agreed upon.
Reference: Bulugh al-Maram 746
In-book reference: Book 6, Hadith 39
English translation: Book 6, Hadith 765