Primary references are in the Psalms – 117, 97, and 99. But other references give the background for the inclusion of all nations, particularly Genesis 12:1-3, Acts 1:8, 10:34- 36, Galatians 5:26-27 and Revelation 7:9-17.
Sometimes the soul of the Christian needs to cry out exuberantly with joy, thanks, and adoration, even without identifying the reasons for such praise and adoration. Moreover, Christians who gather corporately find it fitting to do so as the grateful body of Christ. The Confessions of the church recognize this natural expression. Belgic Confession, Article 1 sees God as the “overflowing source of all good,” and such a realization deserves an “Alleluia!” Heidelberg Catechism, Lord’s Day 1, Question and Answer 2 is a reminder that living in the joy of our comfort involves a spirit of thanks for his deliverance. In the same spirit, Our World Belongs to God, paragraph 2 exclaims, “God is King: Let the earth be glad! Christ is victor: his rule has begun! The Spirit is at work: creation is renewed!” and then as a natural response cries: “Hallelujah! Praise the Lord!”