“For the LORD takes pleasure in his people; he adorns the humble with salvation” (Psalm 149:4). For most of Israel’s history, they were “the humble:” slaves in Egypt, and then later the subjugated colony of various empires. Their praise to God focused on both His marvelous creation and His “mighty acts” on behalf of His suffering people. They rejoiced that one day “the kings and nobles” (v8) who oppressed them would be judged by God, who doesn’t favor the winners of the world.
“Praise him for his mighty deeds; praise him according to his excellent greatness!” 150:2). We give God praise because He is all-powerful, and He uses His power to save the humble and strengthen the weak.