The Messenger of Allah ﷺ used to recite the qunut in the Fajr and Maghrib prayers.
أن رسول الله ﷺ كان يقنت في الصبح والمغرب.
No references are available.
Muslim narrated it in "The Mosques" (678) from the hadith of Shubah, from Amr bin Mura, who said, "I heard Ibn Abu Layla say, 'Bara bin Azib narrated to us,'" and he mentioned it.