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The Grafted Branch of Israel.
We are a grafted BRANCH into Israel; that means that Christians are now Israel in the new covenant. The elect have become the seed of Abraham and a Jew is one by election and not birth.
Jeremiah 31:31 "The time is coming", declares the Lord, "when I will make a new covenant with the house of Israel." See also:
Gen 35:10-11, Ex 20:8-10, Lev 19:34, Isa 9:3, Isa 26:15, Isa 44:5, Isa 46:13, Isa 56:3-6-8, Isa 62:2, Isa 65:15, and the examples go on.
John 1:12- "sons of God"
John 11:52- "gathering together in one the children of God."
Rom 8:14-16- "are the children of God"
2Cr 6:18- "shall be my sons and daughters"
Gal 4:5-7- "heir of God through Christ"
1John 3:2- "we should be called sons of God."
Rom 9:6-7- "they are not all Israel, which are of Israel"
Gal 4:25-30. "are the children of promise"
Gal 3:7. "which are of faith, the same are the children of Abraham"
Gal 3:29. "And if you belong to Christ, then you are Abraham's seed, and heirs according to the promise."
Rom 2:29. "But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in letter, whose praise is not of men, but of God."
2Cr 6:16. "I will be their God and they shall be my people."
Eph 2:12-19. "That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world: But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ. For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us; having abolished in his flesh the enmity, (enmity means hostility) [even / toward] the law of commandments contained in ordinances; for to make in himself of [twain / us] one new man, so making peace; And that he might reconcile both unto God in one body by the [cross / stake], having slain the enmity (hostility) thereby: And came and preached peace to you which were far away, and to them that were near. For through him we both have access through one Spirit unto the Father. Now therefore you are no longer strangers and foreigners, but fellow citizens with the saints, and of the household of God;"
1Peter 2:9. "But you are a chosen generation, a royal priesthood, and holy nation, a peculiar people; that ye should show forth the praises of Him who has called you out of darkness into his marvelous light: Which in time past (were not) a people, but (are now) the people of God: which hand not obtained mercy, but now have obtained mercy."
John 17:22. "And the glory which you gave me I have given them; that they may be one, even as we are one."