He inviteth the angels here, and the senseless creatures afterward, to praise God; not as if the former needed, or the latter were capable of, his exhortation, but only by a poetical rapture; the design whereof is, that men by this means might be more provoked to this duty. The angels are called hosts, here and 1 Kings 22:19, for their vast numbers, exquisite order, and perfect subjection to their General, the Lord of hosts.
Related Commentaries of Psalms 148:2
Psalms 148:2
2 Praise ye him, all his angels: praise ye him, all his hosts.