Romans 15:6-7, 9-13

so that with one accord you may with one voice glorify and praise and honor the God and Father of our Lord Jesus Christ. Therefore, [continue to] accept and welcome one another, just as Christ has accepted and welcomed us to the glory of [our great] God.

and for the Gentiles to glorify God for His mercy [to them, since God had no covenant with them]. As it is written and forever remains written, “THEREFORE I PRAISE YOU AMONG THE GENTILES, AND SING PRAISES TO YOUR NAME.” [Ps 18:49] Again it says, “REJOICE and CELEBRATE, O GENTILES, ALONG WITH HIS PEOPLE.” [Deut 32:43] And again, “PRAISE THE LORD ALL YOU GENTILES, AND LET ALL THE PEOPLES PRAISE HIM!” [Ps 117:1] Again Isaiah says, “THERE SHALL BE A ROOT OF JESSE, HE WHO ARISES TO RULE [as King] OVER THE GENTILES, IN HIM SHALL THE GENTILES HOPE.” [Is 11:1, 10; Rev 5:5; 22:16] May the God of hope fill you with all joy and peace in believing [through the experience of your faith] that by the power of the Holy Spirit you will abound in hope and overflow with confidence in His promises.