Rom 15:11-12
In the Old Testament, David praised God who had saved him and gave thanks to God among the nations. (2 Samuel 22:50-51)
2 Samuel 22:50 Therefore I will give thanks unto thee, O Lord, among the heathen, and I will sing praises unto thy name. 51 He is the tower of salvation for his king: and sheweth mercy to his anointed, unto David, and to his seed for evermore.
In the Old Testament, it was prophesied that all nations would wait for Christ, who would come as the descendant of David, and rejoice in Him. That Christ is Jesus. (Romans 15:11-12)
Romans 15:11 And again, Praise the Lord, all ye Gentiles; and laud him, all ye people. 12 And again, Esaias saith, There shall be a root of Jesse, and he that shall rise to reign over the Gentiles; in him shall the Gentiles trust.