What is too rarely seen by commentators is that the discussion of singing and the glorification of God, in [Romans] 15:5-13, most likely comes about because Paul still has in mind the same gatherings of the Roman believers [cf. the discussion about common meals in chapter 14], which combine, at a minimum, eating together, and singing together. In Romans 15:5-7 we read, “May the God of endurance and encouragement grant you to live in such harmony with one another, in accord with Christ Jesus, that together you may with one voice glorify the God and Father of our Lord Jesus Christ. Therefore welcome one another as Christ has welcomed you, for the glory of God.” The unity which Paul has been calling for is to be expressed in united praise, here described literally as glorifying God “with one mouth” (en eni stomati). The outworking of Jews and Gentiles welcoming one another “for the glory of God,” is to glory God with one another. And this is expressed in particular through spoken or sung praise.