Rom 7:1 "Know ye not, brethren, (for I speak to them that know the law,) how that the law hath dominion over a man as long as he liveth?"
Rom 7:2 "For the woman which hath an husband is bound by the law to [her] husband so long as he liveth; but if the husband be dead, she is loosed from the law of [her] husband."
Rom 7:3 "So then if, while [her] husband liveth, she be married to another man, she shall be called an adulteress: but if her husband be dead, she is free from that law; so that she is no adulteress, though she be married to another man. "
Rom 7:4 "Wherefore, my brethren, ye also are become dead to the law by the body of Christ; that ye should be married to another, [even] to him who is raised from the dead, that we should bring forth fruit unto God."
Rom 7:5 " For when we were in the flesh, the motions of sins, which were by the law, did work in our members to bring forth fruit unto death. "
Rom 7:6 "But now we are delivered from the law, that being dead wherein we were held; that we should serve in newness of spirit, and not [in] the oldness of the letter. "
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Col 2:14 "Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took (perfect tense) it out of the way, nailing it to his cross;"
Perfect tense denoting the OT law was permanently taken out of the way never to be made effective again.
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Heb 10:9 "Then said he, Lo, I come to do thy will, O God. He taketh away the first, that he may establish the second."
Christ took away the first for two laws cannot exist and be followed at the same time, see Rom 7:1-6 above
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Eph 2:12 " That at that time ye (Gentiles) 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:"
Eph 2:13 "But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ."
Eph 2:14 " For he is our peace, who hath made both one, and hath broken down the middle wall of partition [between us]; "
Eph 2:15 "Having abolished in his flesh the enmity, [even] the law of commandments [contained] in ordinances; for to make in himself of twain one new man, [so] making peace;"
Eph 2:16 " And that he might reconcile both unto God in one body by the cross, having slain the enmity thereby."
Christ abolished "the law of commandments [contained] in ordinances". He "hath broken down the middle wall of partition" between Jew and Gentile. Why? "that he might reconcile both (Jew & Gentile) unto God in one body by the cross, having slain the enmity thereby". So Christ had to remove, abolish the OT law to reconcile Jew and Gentile together within the one body, the one church for that could never happen if the OT that was given to the Jews and not the Gentiles (verse 12) remained in effect.