Albert Barnes Commentary Psalms 144:5

"Bow thy heavens, O Jehovah, and come down: Touch the mountains, and they shall smoke." — Psalms 144:5 (ASV)

Bow your heavens, O Lord ... - Come to my aid “as if” the heavens were bent down; come down with all your majesty and glory. See the notes at (Psalms 18:9): He bowed down the heavens also, and came down. What is declared there that the Lord “had” done, he is here implored to do again.

Touch the mountains, and they shall smoke - See the notes at (Psalms 104:32): He toucheth the hills, and they smoke. It is affirmed there as a characteristic of God that he “does” this; here the psalmist prays that, as this belonged to God, or was in his power, he “would” do it on his behalf. The prayer is that God would come to his relief “as if” in smoke and tempest—in the fury of the storm.