That I should be the minister ( λειτουργὸν) of Jesus Christ unto the Gentiles, ministering ( λειτουργοῦντα) the gospel of God, that the offering up of the Gentiles might be acceptable, being sanctified in the Holy Ghost.
As to the words λειτουργὸς and λευτουργεῖν, see on Romans 13:6; and on λατρεύω, λατρεία on Romans 1:9 and Romans 12:1. Here they are evidently used in their sacrificial meaning, but applied metaphorically; the "acceptable offering" which Paul offers to God is that of the Gentiles whom he brings to the faith.
"The preaching of the gospel he calls a sacrificial service ( ἱερουργιάν), and genuine faith an acceptable offering" (Theodoret). "This is my priesthood, to preach and to proclaim" (Chrysostom); cf Philippians 2:17.