Charles H. Spurgeon on Psalms 149:2

Let Israel rejoice in him that made him. Here is that new creation which calls for the new song. It was Jehovah who made Israel to be Israel, and the tribes to become a great nation: therefore let the Founder of the nation be had in perpetual honour. Joy and rejoicing are evidently to be the special characteristics of the new song. The religion of the dead in sin is more apt to chant dirges than to sing hallelujahs; but when we are made new in the spirit of our minds we joy and rejoice in him that made us. Our joy is in our God and King: we choose no lower delight. Let the children of Zion be joyful in their King. Those who had seen the tribes formed into a settled kingdom as well as into a united nation should rejoice. Israel is the nation, Zion is the capital of the kingdom: Israel rejoices in her Maker, Zion in her King. In the case of our God we who believe in him are as glad of his Government as we are of his Creation: his reign is as truly the making of us as was his divine power. The children of Israel are happy to be made a people; the children of Zion are equally happy to be ruled as a people. In every character our God is the source of joy to us: this verse issues a permit to our joy, yea it lays an injunction upon us to be glad in the Lord.