The Gentiles are partakers of the blessing of Romans 15:26-27. The Gospel records clearly demonstrate that the New Covenant was offered to the Jews first. In Matthew 10, Jesus sent the disciples to preach the Gospel only to the nation of Israel. Only after the Jewish leadership rejected Christ was the Great Commission expanded to include all nations [Matt:28:18-20].
(Mat 28:18-20 KJV) And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth. {19} Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: {20} Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.
(Rom 1:16 KJV) For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.
(Rom 15:8-12 KJV) Now I say that Jesus Christ was a minister of the circumcision for the truth of God, to confirm the promises made unto the fathers: {9} And that the Gentiles might glorify God for his mercy; as it is written, For this cause I will confess to thee among the Gentiles, and sing unto thy name. {10} And again he saith, Rejoice, ye Gentiles, with his people. {11} And again, Praise the Lord, all ye Gentiles; and laud him, all ye people. {12} And again, Esaias saith, There shall be a root of Jesse, and he that shall rise to reign over the Gentiles; in him shall the Gentiles trust.
(Rom 15:26-27 KJV) For it hath pleased them of Macedonia and Achaia to make a certain contribution for the poor saints which are at Jerusalem. {27} It hath pleased them verily; and their debtors they are. For if the Gentiles have been made partakers of their spiritual things, their duty is also to minister unto them in carnal things. -- From:
http://www.velocity.net/~edju/Abraham9.htm