Musannaf Ibn Abi Shayba 3:5035

Abu Bakr narrated to us, he said: Abu Mu'awiyah narrated to us, from al-A'mash, from Thabit ibn 'Ubayd, from al-Qasim ibn Muhammad, from 'Aishah, she said: The Messenger of Allah (peace and blessings of Allah be upon him) said to me: "Hand me the prayer mat (khumrah) from the mosque." I said: "I am menstruating." He said: "Indeed, your menstruation is not in your hand."