Galatians 4:23 in the World English Bible
However, the son by the servant was born according to the flesh, but the son by the free woman was born through promise.
Context
22 For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman.
23 But he who was of the bondwoman was born after the flesh; but he of the freewoman was by promise.
24 Which things are an allegory: for these are the two covenants; the one from the mount Sinai, which gendereth to bondage, which is Agar.