1.

Make a joyful noise unto the LORD, all ye lands.

Make a joyful noise; partly with voices and songs of rejoicing and thanksgiving; and partly with musical instruments, as the manner then was.
All ye lands; all the inhabitants of the earth. Or, all the land, i.e. all the people of Israel dwelling in this land. Although his invitation seems to be more general, extending also to the Gentiles, of whom many even in those days joined themselves to the church of God.

2.

Serve the LORD with gladness: come before his presence with singing.

3.

Know ye that the LORD he is God: it is he that hath made us, and not we ourselves; we are his people, and the sheep of his pasture.

It is he that hath made us; both by creation, and by adoption and regeneration, whereby he made us his people, which also is called a creation or making, as Deuteronomy 32:6; Isaiah 29:23; Isaiah 43:7; Ephesians 2:10.
And not we ourselves; therefore we owe him homage and service, and him only, and not other gods, who made us not.

4.

Enter into his gates with thanksgiving, and into his courts with praise: be thankful unto him, and bless his name.

Enter into his gates; the gates of his courts; for the people might enter no further, and the courts had walls and gates as well as the house.

5.

For the LORD is good; his mercy is everlasting; and his truth endureth to all generations.