It is narrated 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. Sayyiduna Uqbah (may Allah be pleased with him) said: "Then the Messenger of Allah (peace and blessings be upon him) led us in the Fajr prayer with these two."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15002