Musnad Abu Ya'la al-Mawsili 149:132

Ibrahim narrated to us, Hammad narrated to us, from al-Hajjaj, from Thabit ibn Ubayd, from al-Qasim ibn Muhammad, from Aisha, that the Messenger of Allah (peace be upon him) said to her: "Hand me the prayer mat." She said: "I am menstruating." The Messenger of Allah (peace be upon him) said: "Indeed, your menstruation is not in your hands."