Romans 15:16, 27

to be a minister of Christ Jesus to the Gentiles. He gave me the priestly duty of proclaiming the gospel of God, so that the Gentiles might become an offering acceptable to God, sanctified by the Holy Spirit.

They were pleased to do it, and indeed they owe it to them. For if the Gentiles have shared in the Jews’ spiritual blessings, they owe it to the Jews to share with them their material blessings.