Not only that but the Mosaic Law Covenant was a covenant of WORKS! Moses brought the Law to Israel. But Grace and Truth came by the Greater Moses (Jn 1:17)!
Now the Lord had said unto Abram, Get thee out of thy country, and from thy kindred, and from thy father's house, unto a land that I will shew thee:
2 And I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing:
3 And I will bless them that bless thee, and curse him that curseth thee: and in thee shall all families of the earth be blessed.
And Abrahams promised inheritance was worldwide Rom 4:13
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.