Musnad Ahmad 1153:777

Aswad ibn Amir and Abu Nu'aym narrated to us, they said: Sharik narrated to us, from al-Abbas ibn Dharih, from al-Bahiy, from Aisha, that the Prophet, peace and blessings of Allah be upon him, said to her: "Hand me the prayer mat." She said: "I am menstruating." He said: "It is not in your hand." Abdullah ibn Ahmad said: My father said: Waki' also narrated it to us.