Psalms 100:1-5
1 Make a joyful noise unto the LORD, all ye lands.
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.
4 Enter into his gates with thanksgiving, and into his courts with praise: be thankful unto him, and bless his name.
5 For the LORD is good; his mercy is everlasting; and his truth endureth to alla generations.
This is the last song of the series, and forms a fitting conclusion to the movement which commenced in Psalms 93:1. There the Divine assumption of the throne and government was the subject. Here it is that of the benefits resulting to the whole earth. All lands are called upon to sing the song of His reign. The strength of their song is to be their service rendered with gladness. Israel is viewed as the witness to the Divine power and goodness.
The peoples are supposed to see the position of the chosen people in all its desirableness, and they are reminded that their well-being is the result of the government of God.
Then the great invitation is given to the outlying people to enter His gates, to yield to Him, and share in His benefits. This is the true position and witness of God's chosen people according to His purpose for them, and through them, for others. It is a glimpse of a glory not realised by ancient people. They never learned how to invite the outsider into the place of privilege. Because of their failure to do this, Israel as an earthly people is scattered and peeled. The Church, the spiritual Israel, fulfills, or ought to fulfil this function.