Musannaf Ibn Abi Shayba 3:588

Abu Khalid al-Ahmar narrated to us, from Yazid ibn Harun, from Husayn al-Mu'allim, from Budayl, from Abu al-Jawza', from 'Aishah, who said: When the Messenger of Allah (peace and blessings of Allah be upon him) bowed, he would neither raise his head nor lower it, but [he would keep it] between that. When he raised his head from bowing, he would not prostrate until he stood upright. When he prostrated and raised his head, he would not prostrate [again] until he sat upright. And he used to say the *tahiyyah* between every two rak'ahs.