For it is written, that Abraham had two sons, the one by a bondmaid, the other by a free woman.
All Commentaries on Galatians 4:22 Go To Galatians 4
John Chrysostom
AD 407
He returns once again to Abraham, not repeating the same thing but because the reputation of Abraham was great among the Jews. He shows that the types have their origin in him and that present things were adumbrated in him.