And suddenly there was with the angel a multitude of the heavenly host praising God, and saying,
All Commentaries on Luke 2:13 Go To Luke 2
John Chrysostom
AD 407
Of old, indeed, Angels were sent to punish, as, for instance to the Israelites, to David, to the men of Sodom, to the valley of weeping. Now on the other hand they sing the song of thanksgiving to God: because He has revealed to them His coming down to men.
Behold the wonderful fill working of God. He first brings Angels down to men, and then brings men up to heaven. The heaven became earth, when it was about to receive earthly things.