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● Gen 26:5 . . . Abraham obeyed my voice, and kept my charge, my statutes,
my commandments, and my laws.
Jews sometimes use that passage to prove Abraham's association with God
was regulated by the covenant that Moses' people entered into with God per
Exodus, Leviticus, Numbers, and Deuteronomy, but he was clearly excluded.
"The Lord our God made a covenant with us in Horeb. Not with our
forefathers did The Lord make this covenant, but with us, we, all of whom
are here alive today." (Deut 5:2-3)
Moses' covenant is a compulsory legal system that requires its participants to
obey or else suffer stipulated consequences, whereas Abraham's association with
God was based upon an honor system wherein are no stipulated consequences
for disobedience.
For example: Moses' covenant prohibits dishonesty.
"Do not lie; do not deceive one another." (Lev 19:11)
When Moses' people fail to comply with that rule they get slammed with a
curse.
"Cursed is the man who does not uphold the words of this law by carrying
them out." (Deut 27:26)
Well; as all Bible readers know; Abraham wasn't entirely honest about his
relationship with Sarah. But Abraham wasn't cursed for attempting to
deceive certain folks with a half-truth because his association with God
wasn't regulated by Moses' covenant. Christ's followers enjoy the very same
advantage.
In Matthew 4:15-23, Jesus began his ministry with the Gospel message to repent for the Kingdom of God is at hand, which was a light to the Gentiles, and the Mosaic Law was how his audience knew what sin is (Romans 3:20), so repenting from our disobedience to it is a central part of the Gospel of the Kingdom, which is in accordance with Jesus being sent in fulfillment of the promise to bless us by turning us from our wickedness (Acts 3:25-26), which is the Gospel that was made known in advance to Abraham in accordance with the promise (Galatian 3:8), which he spread to Gentiles in Haran in accordance with the promise (Genesis 12:1-5).
In Genesis 18:19, God knew Abraham that he would teach his children and those of his household to walk in God's way by doing righteousness and justice that the Lord may bring to him all that He has promised. In Genesis 26:4-5, God will multiply Abraham's children as the stars in the heaven, to his children He will give all of these lands, and through his children all of the nations of the earth will be blesses because he heard God's voice and guarded His charge, commandments, statutes, and laws. In Deuteronomy 30:16, if the children of Abraham will love God with all of their heart by walking in His way in obedience to His commandments, states, and laws, then they will live and multiply and God will bless them in the land that they go to possess. So the promise was made to Abraham and brought about because he walked in God's way in obedience to His law, he taught his children and those of his household to do that in accordance with spreading the Gospel of the Kingdom that was made known in advance to him, and because they did that in obedience to the Torah.
In Psalms 119:1-3, the Torah is how the children of Abraham know how to be blessed, and in John 8:39, Jesus said that if they were children of Abraham, then they ought to be doing the same works that he did, so the way that the children of Abraham are multiplied and are a blessing to the nations in accordance with inheriting the promise through faith is by turning the nations from their wickedness and teaching them to do the same works as Abraham by walking in God's way in obedience to the Torah in accordance with spreading the Gospel of the Kingdom.
In Exodus 33:13, Moses wanted God to be gracious to him by teaching him to walk in His way that he and Israel might know Him, and in John 17:3, eternal life is knowing God and Jesus, so both Abraham and Moses spread the Gospel of the Kingdom by turning people from their wickedness and teaching them to obey the Torah. In regard to Deuteronomy 5:2-3, if God made the New Covenant with us that He didn't make with those at Horeb, and it contains at least some of the same laws as the covenant that God made at Horeb, then the fact that God made a covenant with them at Horeb that he did not make with their forefathers does not mean that their forefathers did not follow the same laws. For example, in Genesis 39:9, Joseph knew that it was a sin to commit adultery, it was a sin under the Mosaic Covenant, it is a sin under the New Covenant, and it will always be a sin to do that.
"Sin shall not be your master, because you are not under the Law" (Rom 6:14)
"My brethren, you are become dead to the Law by the body of Christ" (Rom 7:4)
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The Law of God is a law where holiness, righteousness, and goodness are our master (Romans 7:12), while it is the law of sin where sin was our master, so that is the law that Romans 6:14 is referring to us as not being under. In Romans 6:15, being under grace does not mean that we are permitted to sin, and sin is the transgression of the Law of God (1 John 3:4), so we are still under the Law of God, but are not under the law of sin.
Moreover, everything else in Romans 6 speaks in favor of obedience to God and against sin, so Romans 7:4 should not be interpreted in a way that contradicts Romans 6:15-7:3. It would not make sense to think that we need to die to God's word in order to be unified with God's word made flesh, but rather God's word is His instructions for how to be unified with God's word made flesh. Likewise, it would be absurd to think that we need to die to God's instructions for how to bear fruit for Him in order to be free to bear fruit for Him, but rather we need to die to a law that was hindering us from bearing fruit for God, namely the law of sin.