Acts 13:46

46, 47. When men take a stand like this, nothing will satisfy them but an abandonment of the truth; and hence that conciliatory bearing which should mark our address to them up to this point, may, with propriety, be dismissed, and we may proceed without regard to their feelings. So the apostles acted. (46) "Then Paul and Barnabas, speaking boldly, said, It was necessary that the word of God should first be spoken to you; but since you put it from you, and judge yourselves unworthy of everlasting life, behold we turn to the Gentiles. (47) For thus has the Lord commanded us, I have placed thee as a light of the Gentiles, that thou mayest be for salvation to the extremity of the earth."

The remark that it was necessary that the word of God should first be spoken to them, before turning to the Gentiles, shows that the apostles understood that the gospel was not only to begin in Jerusalem, but that, in every distinct community, it was to begin with the Jews. Hence the frequent occurrence, in Paul's style, of the expression, "To the Jew first, and also to the Gentile." The reason of this distinction has been discussed in the commentary on Acts 1:8 Acts 1:8>.