Bede

For the son of the bondwoman shall not be heir with my son Isaac. Which the Apostle states as with the son of the freewoman, because in no way should false teachers, who affirm that this grace benefits us only if we are also consecrated by circumcision according to the rite of the law, be received with the preachers of the truth, who proclaim that we should be saved by the grace of the Lord Jesus. …

Commentary on Genesis (Hexaemeron) ↗