By the word of the LORD were the heavens made; and all the host of them by the breath of his mouth.
As heretofore David has dwelt on Yahweh's faithfulness, righteousness, and goodness, as proving that He is willing to help his people, so now David turns to the proofs that Yahweh is also able to save them. As "the earth" supplied the Psalmist with illustrations of Yahweh's goodness, so "the heavens" afford the proof of Yahweh's power, (Psalms 8:1-9 and Psalms 19:1-14.)
By the word of the Lord ... all the host of them ... "The host of them" is the heavenly bodies-the sun, moon, and stars (Genesis 2:1). The mere "breath of His mouth," as contrasted with man's laborious efforts before he can achieve his puny works, was enough to call myriads of beautiful and orderly worlds into being (cf. Isaiah 11:4; Job 33:4; Psalms 104:30). The DIVINE WORD and the DIVINE SPIRIT cooperated at creation (Genesis 1:2-3).