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The mystery that Paul mentioned, that the “seed of Abraham” was scattered among the gentiles?
What especially is it that you see in it?
Starting in Romans, Paul makes it plain that one must be of that seed to be saved, all that are saved are the Seed of Abraham.
Rom.4:
[1] What shall we say then that Abraham our father, as pertaining to the flesh, hath found?
[2] For if Abraham were justified by works, he hath whereof to glory; but not before God.
[3] For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness.
[4] Now to him that worketh is the reward not reckoned of grace, but of debt.
[5] But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness.
[6] Even as David also describeth the blessedness of the man, unto whom God imputeth righteousness without works,
[7] Saying, Blessed are they whose iniquities are forgiven, and whose sins are covered.
[8] Blessed is the man to whom the Lord will not impute sin.
[9] Cometh this blessedness then upon the circumcision only, or upon the uncircumcision also? for we say that faith was reckoned to Abraham for righteousness.
[10] How was it then reckoned? when he was in circumcision, or in uncircumcision? Not in circumcision, but in uncircumcision.
[11] And he received the sign of circumcision, a seal of the righteousness of the faith which he had yet being uncircumcised: that he might be the father of all them that believe, though they be not circumcised; that righteousness might be imputed unto them also:
[12] And the father of circumcision to them who are not of the circumcision only, but who also walk in the steps of that faith of our father Abraham, which he had being yet uncircumcised.
[13] For the promise, that he should be the heir of the world, was not to Abraham, or to his seed, through the law, but through the righteousness of faith.
Romans 15:27 They were pleased to do it, and indeed they owe it to them. For if the Gentiles have shared in the Jews' spiritual blessings, they owe it to the Jews to share with them their material blessings.