Musnad Abu Ya'la al-Mawsili 106:18

Muhammad ibn Bakkar, the freed slave of Banu Hashim, narrated to us, Yahya ibn Uqbah ibn Abi al-Ayzar narrated to us, Abu Ishaq narrated to us, from al-Bara’ who said: We prostrated with the Messenger of Allah (may Allah bless him and grant him peace) during the Dhuhr prayer, and we thought that he had recited "Tanzil al-Sajdah."