Musnad Abu Ya'la al-Mawsili 150:384

Mujahid ibn Musa narrated to us, Muhammad ibn Abdullah and Yazid narrated to us, they said: Muhammad ibn Amr al-Laythi narrated to us, Abu Salamah narrated to us, from Aisha, who said: The Messenger of Allah (peace and blessings of Allah be upon him) used to pray while I was lying across in front of him in the house. When he intended to perform the Witr, he would nudge me with his foot and say, "Move aside."