Albert Barnes Commentary Romans 15:10

"And again he saith, Rejoice, ye Gentiles, with his people." — Romans 15:10 (ASV)

And again, etc. Deuteronomy 32:43. In this place, the nations or Gentiles are called on to rejoice with the Jews, for the interposition of God in their behalf. The design of the quotation is to show that the Old Testament speaks of the Gentiles as called on to celebrate the praises of God; of course, the apostle infers that they are to be introduced to the same privileges as his people.