Musnad Ahmad 1153:1189

Abu Abd al-Rahman al-Muqri narrated to us, Dawud narrated to us, from Ibrahim, from Ata, who said: I heard that the black dog and the menstruating woman interrupt the prayer. Ata said: Urwah ibn al-Zubayr narrated to me that Aisha informed him that the Messenger of Allah, peace and blessings of Allah be upon him, prayed while she was lying across in front of him. And he said: "Are they not your mothers, your sisters, and your paternal aunts?"