Albert Barnes Commentary Psalms 148:5

"Let them praise the name of Jehovah; For he commanded, and they were created." — Psalms 148:5 (ASV)

Let them praise the name of the Lord - That is, Let them praise Yahweh himself - the name being often put for the person or thing referred to.

For he commanded, and they were created - He showed his great power by merely speaking, and they came at once into being. Compare [Psalms 33:6], note; [Psalms 33:9], note.