Musnad Abu Ya'la al-Mawsili 150:275

Sufyan ibn Waki' narrated to us, my father narrated to us, from Ubaydullah ibn Abi Humayd, from Abu Mulayh, who said: Abdullah ibn Rabah al-Ansari narrated to us that Aisha said: The Messenger of Allah (peace and blessings of Allah be upon him) used to pray the two rak'ahs before the break of dawn. Then he would say in his place of prayer: "O Allah, Lord of Jibril, Mika'il, Israfil, and Lord of Muhammad, I seek refuge in You from the Fire." Then he would go out to his prayer.