Romans 1:9

1:9 For God, whom I serve in my spirit by preaching the gospel of his Son, is my witness that I continually remember you

Romans 8:9

8:9 You, however, are not in the flesh but in the Spirit, if indeed the Spirit of God lives in you. Now if anyone does not have the Spirit of Christ, this person does not belong to him.

Romans 15:16

15:16 to be a minister of Christ Jesus to the Gentiles. I serve the gospel of God like a priest, so that the Gentiles may become an acceptable offering, sanctified by the Holy Spirit.