Paul instructed Jewish and Gentile believers to live in peace together:
Romans 15:7-9 Therefore, accept each other just as Christ has accepted you so that God will be given glory. Remember that Christ came as a servant to the Jews to show that God is true to the promises he made to their ancestors. He also came so that the Gentiles might give glory to God for his mercies to them.
And to reinforce this idea, Paul finished his letter to the Romans with:
Romans 16:25-27 Now all glory to God, who is able to make you strong, just as my Good News says. This message about Jesus Christ has revealed his plan for you Gentiles, a plan kept secret from the beginning of time. But now as the prophets foretold and as the eternal God has commanded, this message is made known to all Gentiles everywhere, so that they too might believe and obey him. All glory to the only wise God, through Jesus Christ, forever. Amen.