(21) Hosts.--There are apparently in the psalmist's thought three grades of beings in the hierarchy of praise:--

1.High angels around the throne.

2. Angelic powers, such as winds, lightnings, &c, specially commissioned to do God's behests, as in Psalm 104:4.

3.Creation generally. (Comp. Psalms 148)

Verse 21. - Bless ye the Lord, all ye his hosts. Here the inferior angels seem to be meant - that "multitude of the host of heaven" which appeared to the shepherds on Christ's natal day (Luke 2:13), and which is elsewhere often referred to in Holy Scripture (see Psalm 24:10; Psalm 148:2; Isaiah 40:26; Matthew 25:31; Mark 8:38; Luke 9:26; Hebrews 12:22; Jude 1:14). Ye ministers of his (comp. Psalm 104:4) that do his pleasure. The inferior, no less than the superior, ranks of angels continually carry out the will of God, being "ministering spirits, sent forth to minister for them who shall be heirs of salvation" (Hebrews 1:14).

103:19-22 He who made all, rules all, and both by a word of power. He disposes all persons and things to his own glory. There is a world of holy angels who are ever praising him. Let all his works praise him. Such would have been our constant delight, if we had not been fallen creatures. Such it will in a measure become, if we are born of God. Such it will be for ever in heaven; nor can we be perfectly happy till we can take unwearied pleasure in perfect obedience to the will of our God. And let the feeling of each redeemed heart be, Bless the Lord, O my soul.Bless ye the Lord, all ye his hosts,.... Which some understand of the sun, moon, and stars, sometimes called the hosts of heaven; and who in their way bless and praise the Lord; see Psalm 148:2. Others, of the angels, as before; who are sometimes styled the heavenly host, Luke 2:13, and may be so called from their numbers, there being legions of them; and for their military employment, in guarding and protecting the saints, in encamping about them, and fighting for them. Or rather, since these seem to be distinguished from the angels before addressed, by them may be meant the church militant and her members; who are like an army with banners, consisting of volunteer soldiers under Christ, the Captain of their salvation; whose battles they fight against sin, Satan, and the world; and have a great deal of reason to bless and praise the Lord, for all the great and good things he has done to them, and for them.

Ye ministers of his that do his pleasure; so the angels are called, and they do the will of God; what is acceptable to him, and well pleasing in his sight, Hebrews 1:7. But rather, as distinct from them, the ministers of the Gospel are intended; a name which the preachers of it bear, both in the Old and in the New Testament, Isaiah 61:4, They are ministers of Christ's appointing, calling, qualifying, and sending; and who are employed in his service, in preaching him, his Gospel, and the truths of it; and who do his pleasure, that which is grateful to him, when they speak his word faithfully, declare his whole counsel, and keep back nothing that is profitable: and these have reason to bless the Lord for the gifts bestowed upon them, and for their success and usefulness; and indeed they bear a leading part in giving praise and glory to God, Revelation 4:9.