What does Romans 15:28 mean?

Returning to his main point about coming to see the Christians in Rome, Paul sums up his earlier statements. He will travel to them after he delivers the financial contributions to the poor Christians in Jerusalem. More specifically, Paul says he will leave for Spain by way of visiting his readers in Rome. To this point, Paul's emphasis on introducing the gospel to unreached areas has prevented him from passing through Rome (Romans 15:20–22).

He also uses unusual language to describe his delivery of the money to Jerusalem. He says that he will leave when he has "sealed to them this fruit." Likely, by fruit, he means the financial gift of the Gentile Christians. It is the fruit, or product, of both their generosity and their faith in God. Paul will "seal" it in the sense that he will complete the task by handing it off to the right people and verifying who it is from and what it is for.