Galatians 3:18 discusses the inheritance of The Promise to Abraham and how it transfers through Abraham to his “seed”.
Here, Paul is saying the transfer of The Promise is not through false, man made, laws, rules, requirements, doctrines which we read in Matthew through John that God’s Son fought against continuously – but The Promise was made to Abraham through faith in following YHVH God the Father and doing what YHVH said to do.
These false, man made, laws, rules, requirements, and doctrines are what is known today as Talmudic Judaism in which Judaizer’s define additional requirements for the people on top of THE LAW God the Father, YHVH, gave to the children of Israel in The Wilderness.
Paul is saying throughout Galatians that no one can gain salvation and eternal life through man’s false made up controlling laws!
Now, after Abraham came Isaac and YHVH God the Father felt the need to express to Isaac the REASON the promise Abraham qualified for The Promise:
Genesis 26:4-5 And I will make your descendants multiply as the stars of heaven; I will give to your descendants all these lands; and in your seed all the nations of the earth shall be blessed; 5 because Abraham obeyed My voice and kept My charge, My commandments, My statutes, and My laws.”
It is written into Genesis the WHY of Abraham because he kept all of God’s Commandments.
It is written into Galatians the differentiation between God’s LAW and man’s false made up laws so everyone could understand clearly to keep all the Commandments of YHVH God the Father and qualify for salvation after The Judgment and eternal life.
See Revelation 22:14-15
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Be YHVH’s witnesses!