It is important to understand that Gods plan from the beginning has always been to bless ALL PEOPLE through the Jewish people and the nation of Israel.
The following will show the promises made by God in the Old Testament and their fulfillment or application in the New Testament.
FROM THE TORAH (first five books of the Hebrew Bible)
ALL of the families (plural) of the earth were to be blessed through Abraham.
The promise to Abraham was not only to his descendents, but to ALL those who would walk by faith.
Exodus 20:10, 12
God COMMANDED the Gentiles enter into Israels Sabbath rest.
Jesus invites all who are weary to come unto Him, and He will give rest. Gods rest is for those who believe, whether they be Jew or Gentile.
There is NO distinction in obligations between the Gentiles and Israel. Both share in the blessings of God; both have responsibilities to God.
God does not give preference to those who receive the law, but will judge according to the gospel.
FROM THE HISTORICAL WRITINGS
Ruth 1:16-18; 4:13, 21&22
Ruth, a loyal gentile, was greatly blessed by God.
Because Ruth was used to bring forth King David, she was also part of the lineage of King Messiah, Jesus.
1 Chronicles 16:24
Gods glory to be declared among the nations, and His marvelous works among ALL PEOPLES (plural).
Jesus COMMANDED the gospel to be proclaimed to ALL nations.
Gentiles will have a part in the Kingdom of God.
The nations are fellow heirs of Gods promises through the gospels.
The Psalmist will sing praises with the nations Jew and Gentiles together.
I Corinthians 12:13
Jews and Gentiles are united by the Holy Spirit.
ALL the families of the nations will worship before the Lord.
Every knee shall bow and every tongue confess that Jesus is Lord.
FROM THE PROPHETS
Gentiles will come to Gods light.
Luke 2:29, 31
Simeon recognized Jesus as the light who would bring revelation to the Gentiles.
God will show mercy upon one who had not obtained mercy and will say to them which were not His people; You are My people! And they will say, You are my God!
Those who were once strangers and aliens, far from God, have now drawn near through the blood of Christ.
Jonah preached to Gentile Nineveh, the city repented and God spared it.
In contrast to Jonah, the early Messianic Jews rejoiced because the Gentiles received the Word of the Lord.