Musnad Abu Ya'la al-Mawsili 110:144

Abu Khaythama narrated to us, Hushaym narrated to us, Yazid ibn Abi Ziyad narrated to us, from Miqsam, from Ibn Abbas, that the Messenger of Allah (may Allah bless him and grant him peace) was cupped while he was fasting and in the state of ihram.