Musnad Ahmad 658:180

'Abd al-Rahman narrated to us, Sufyan narrated to us, he said: I heard 'Amr ibn Murrah—or he said: he narrated to us from 'Abd al-Rahman ibn Abi Layla—from al-Bara', "That the Prophet, peace and blessings of Allah be upon him, used to perform Qunut in the morning (Fajr) and the sunset (Maghrib) prayers." Shu'bah said the like of it.