Albert Barnes Commentary Psalms 33:6

"By the word of Jehovah were the heavens made, And all the host of them by the breath of his mouth." — Psalms 33:6 (ASV)

By the word of the Lord — By the command of God: Genesis 1:3, Genesis 1:6, and so on. See the notes at Psalm 33:9.

Were the heavens made — That is, the starry heavens, the worlds above us (Genesis 1:1).

And all the host of them — All their “armies.” The stars are represented as armies or marshalled hosts, led forth at His command and under His direction — as armies are led forth in war. See Genesis 2:1; compare the notes at Isaiah 1:9.

By the breath of His mouth — By His word or command — as our words issue from our mouths with our breath. The idea here is that God is the Creator of all things; and, as such, He has a claim to praise; or, as Creator, He is entitled to adoration. To this He is entitled from the fact that He has made all things, and from the “manner” in which it has been done — the wisdom, power, goodness, and skill with which it has been accomplished.