Musannaf Ibn Abi Shayba 3:18

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Mansur, from Ibrahim, from al-Aswad, from Umar that he said when he opened the prayer: "Glory be to You, O Allah, and with Your praise, and blessed is Your name, and exalted is Your majesty, and there is no god other than You."