Musannaf Ibn Abi Shayba 21:599

Hafs ibn Ghiyath narrated to us, from Ibn Jurayj, from ‘Ata’, from ‘Ubayd ibn ‘Umayr, who said: I heard ‘Umar performing Qunut in the dawn [prayer]: "O Allah, we seek Your help, we believe in You, we rely upon You, and we praise You with goodness, and we do not disbelieve in You. O Allah, You alone we worship, and for You we pray and prostrate, and towards You we strive and hasten. We hope for Your mercy and we fear Your punishment; indeed, Your punishment will overtake the disbelievers. O Allah, punish the disbelievers among the People of the Scripture who hinder [others] from Your path."