Musnad Abu Ya'la al-Mawsili 149:131

Ibrahim narrated to us, Hammad narrated to us, from Abu Imran al-Jawni, from Yazid ibn Babnus, that Aisha said: The Messenger of Allah (peace and blessings of Allah be upon him) would reach for my head while I was menstruating, and there was a garment between me and him.