Nevertheless what saith the scripture? Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with the son of the freewoman. What saith the Scripture? - (In Genesis 21:10): Cast out the bond woman and her son: and what does this imply in the present case? Why, that the present Jerusalem and her children shall be cast out of the favor of God, and shall not be heirs with the son of the free woman - shall not inherit the blessings promised to Abraham, because they believe not in the promised seed.
Related Commentaries of Galatians 4:30
Galatians 4:30
30 Nevertheless what saith the scripture? Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with the son of the freewoman.