Musannaf Ibn Abi Shayba 3:10

Abu Bakr narrated to us, he said: Hushaym narrated to us, he said: Husayn informed us, from Abu Wa'il, from al-Aswad ibn Yazid, he said: I saw Umar ibn al-Khattab begin the prayer, so he said the takbir (Allahu Akbar). Then he said: "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."