But God said to Abraham, “Do not let it be grievous in your eyes because of the boy and because of your slave woman. In all that Sarah says to you, listen to her voice, because it is through Isaac that your seed will be called.
“it is through Isaac that your seed will be called.” This is God’s promise that the Messiah will come through Isaac. God’s promise in Genesis 12:3 was much more broad, that all the nations of the earth would be blessed through Abraham—a promise of the Messiah coming through him. Here God says the Messiah will come through Isaac.
REV Bible
