Romans 15:9

That the Gentiles. The Greek construction is difficult. The meaning seems to be that Christ became “a minister of the circumcision” in order to confirm the promises and in order that the Gentiles might glorify God. Christ’s manifestation of God’s truthfulness by His fulfillment of the promises made to Israel is also the foundation of God’s mercy to the Gentiles. He was “a minister of the circumcision” in order that not only Jews but also Gentiles might be saved. Therefore Jewish Christians should be willing to receive Gentile converts and treat them as brethren. Likewise Gentile Christians should be considerate of Jewish believers, realizing that God’s mercy has come to them upon the rejection of the Jews as a nation (see on ch. 11:15).

As it is written. This quotation is from Ps. 18:49. The quotations in vs. 9-12 show that God’s saving plan has from the very first included Gentiles as well as Jews.

Confess. Gr. exomologeomai, here probably meaning, “to praise” (see on ch. 14:11).