I just finish reading Matthew Henry and he talks about how Paul was a Christian priest as he preach the Gospel unto the Gentiles, see below reference and it is not from wikipedia.
Matthew Henry, Romans 15:14-16
(Link:
Matthew Henry's Complete Commentary on the Bible)
What he ministered: the gospel of God; hierourgounta to euangelion—ministering as about holy things (so the word signifies), executing the office of a Christian priest, more spiritual, and therefore more excellent, than the Levitical priesthood. (4.) For what end: that the offering up (or sacrificing) of the Gentiles might be acceptable—that god might have the glory which would redound to his name by the conversion of the Gentiles. Paul laid out himself thus to bring about something that might be acceptable to God. Observe how the conversion of the Gentiles is expressed: it is the offering up of the Gentiles; it is prosphora toµn ethnoµn—the oblation of the Gentiles, in which the Gentiles are looked upon either, [1.] As the priests, offering the oblation of prayer and praise and other acts of religion. Long had the Jews been the holy nation, the kingdom of priests, but now the Gentiles are made priests unto God (Rev. 5:10), by their conversion to the Christian faith consecrated to the service of God, that the scripture may be fulfilled, In ever place incense shall be offered, and a pure offering, Mal. 1:11. The converted Gentiles are said to be made nigh (Eph. 2:13)—the periphrasis of priests. Or, [2.] The Gentiles are themselves the sacrifice offered up to God by Paul, in the name of Christ, a living sacrifice, holy, acceptable to God, ch. 12:1. A sanctified soul is offered up to God in the flames of love, upon Christ the altar. Paul gathered in souls by his preaching, not to keep them to himself, but to offer them up to God: Behold, I, and the children that God hath given me. And it is an acceptable offering, being sanctified by the Holy Ghost. Paul preached to them, and dealt with them; but that which made them sacrifices to God was their sanctification; and this was not his work, but the work of the Holy Ghost. None are acceptably offered to God but those that are sanctified: unholy things can never be pleasing to the holy God.