Musannaf Ibn Abi Shayba 22:299

Abu Usama narrated to us, from Sufyan, from Mu'awiyah ibn Salih, from Abd al-Rahman ibn Jubayr, from his father, from Uqbah ibn Amir, that he asked the Messenger of Allah (may Allah bless him and grant him peace) about the two chapters of seeking refuge (al-Mu'awwidhatayn). He said, "Did the Messenger of Allah (may Allah bless him and grant him peace) lead us in prayer with them during the dawn prayer?" He said, "Yes, if you wish; two blessed, good chapters."