(4) باب الإحرام وما يتعلق به
Ibn 'Abbas (RAA) narrated, 'The Messenger of Allah (ﷺ) had himself cupped while he was in the state of Ihram Agreed upon.
Reference: Bulugh al-Maram 737
In-book reference: Book 6, Hadith 30
English translation: Book 6, Hadith 756