Abd al-Rahman bin Jubayr bin Nufayr narrates from his father, and he from Sayyiduna Uqbah bin Amir (may Allah be pleased with him), that he asked the Messenger of Allah (peace and blessings be upon him) about the Mu'awwidhatayn, and the Messenger of Allah (peace and blessings be upon him) recited them while leading the Fajr prayer.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4049