Musannaf Ibn Abi Shayba 3:547

Yazid ibn Harun narrated to us, from Husayn al-Mu'allim, from Budayl, from Abu al-Jawza', from 'Aisha, who said: When the Prophet, peace and blessings of Allah be upon him, would prostrate and then raise his head, he would not prostrate again until he sat upright. He used to spread out his left foot and keep his right foot upright.