Translation:

19. To Him belong all (creatures) in the heavens and on earth: even those who are in His (very) Presence are not too proud to serve Him nor are they (ever) weary (of His service):

Notes (Tafseer)

2679. The pure angelic hosts, whom we imagine to be glorious creatures of light, high in Heavens, near the Throne of Allah Himself, are yet His creatures, and serve Him without ceasing, and are proud to do so. Such is the majesty of Allah Most High.