Are they not all ministering spirits, sent out to render service for the sake of those who will inherit salvation?
"How oft do they with golden pinions cleave
The flitting skies, like flying pursuivant
Against foul fiends to aid us militant!"
Please read Angels - The Unseen Attendants, by Alistair Begg, at One Place.
"To what dignity are the chosen elevated when the brilliant courtiers of heaven become their willing servants! Into what communion are we raised since we have communion with spotless celestials! How well are we defended since all the twenty thousand chariots of God are armed for our deliverance!"