Galatians 3:17 And this I say, that the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot dis-annul, that it should make the promise of none effect. 18 For if the inheritance be of the law, it is no more of promise: but God gave it to Abraham by promise.
[Patriarchs & Prophets pp 370>371] This same covenant was renewed to Abraham in the promise, “In thy seed shall all the nations of the earth be blessed.” Genesis 22:18. This promise pointed to Christ. So Abraham understood it ( Galatians 3:8, 16), and he trusted in Christ for the forgiveness of sins. It was this faith that was accounted unto him for righteousness. The covenant with Abraham also maintained the authority of God's law. The Lord appeared unto Abraham, and said, “I am the Almighty God; walk before Me, and be thou perfect.” Genesis 17:1.
The testimony of God concerning His faithful servant was, “Abraham obeyed My voice, and kept My charge, My commandments, My statutes, and My laws.” Genesis 26:5. And the Lord declared to him, “I will establish My covenant between Me and thee and thy seed after thee in their generations, for an everlasting covenant, to be a God unto thee and to thy seed after thee.” Genesis 17:7. Though this covenant was made with Adam and renewed to Abraham, it could not be ratified until the death of Christ.
It had existed by the promise of God since the first intimation of redemption had been given; it had been accepted by faith; yet when ratified by Christ, it is called a new covenant. The law of God was the basis of this covenant, which was simply an arrangement for bringing men again into harmony with the divine will, placing them where they could obey God's law.
Romans 3:31 Do we then make void the law through faith? God forbid: yea, we establish the law.
May The Lord add His blessing to the study of His word. God bless!