Musnad Ahmad 1153:2202

Yunus narrated to us, Dawud narrated to us, from Mansur al-Hajbi, who said: My mother, Safiyyah bint Shaybah, narrated to me from Aisha, that she said: "The Messenger of Allah (peace and blessings of Allah be upon him) would recline in my lap while I was menstruating, and he would recite the Quran."