What did God promise Abraham in Genesis 12:3?
God promised Abraham that He would bless those who bless him, curse those who curse him, and that in Abraham all the families of the earth would be blessed. The promise was never abrogated, never taken away, and it was not limited to Israel but extended to all families of the earth.
Les explains that Genesis 12:3 records God's words to Abraham: 'I will bless them that bless thee... I will curse him that curseth thee, and in thee, Abraham, shall all the families of the earth be blessed.' He stresses this promise has never been abrogated, God has never taken it away, and Paul never refuted it. Les emphasizes that the blessing is not just for Israel but for all the families of the earth. He ties it to Israel as the original root and the Gentiles being grafted in, noting that from Abraham until Paul went to the Gentiles, Israel enjoyed the fatness of the root of Abraham.
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.