Hadith 8:1955
Abu Bakr narrated to us, he said: Abu al-Ahwas narrated to us, from al-Ala’ ibn al-Musayyab, who said: It was said to Ata’, "May the one in ihram be cupped?" He said: "Yes, the Messenger of Allah (peace and blessings of Allah be upon him) did that, but he does not shave any hair."
حدثنا أبو بكر قال حدثنا أبو الأحوص عن العلاء بن المسيب قال قيل لعطاء يحتجم المحرم فقال نعم قد فعل ذلك رسول الله صلى الله عليه وسلم ولكن لا يحلق شعرا