Musnad Ahmad 1153:1386

Muhammad ibn Ja‘far narrated to us, he said: Shu‘bah narrated to us, from Sulayman, and ‘Abd al-Razzaq said: Sufyan informed us, with the same meaning, from al-A‘mash, from Thabit ibn ‘Ubayd, from al-Qasim ibn Muhammad, from ‘A’ishah, that she said: The Messenger of Allah (peace and blessings of Allah be upon him) said to her: "Hand me the prayer mat (khumrah)." She said: So I said: "I am menstruating." He said: "It is not in your hand." So she handed it to him.