Musannaf Ibn Abi Shayba 3:120

Abu Bakr narrated to us, he said: Abu Dawud al-Tayalisi narrated to us, from Shu'bah, from al-Hasan ibn 'Imran, from Sa'id ibn 'Abd al-Rahman ibn Abza, from his father, he said: I prayed behind the Prophet, may Allah bless him and grant him peace, and he would not complete the takbir.