John Wesley on Galatians 3:6

Doubtless in confirmation of that grand doctrine, that we are justified by faith, even as Abraham was. The Apostle, both in this and in the epistle to the Romans, makes great use of the instance of Abraham: the rather, because from Abraham the Jews drew their great argument, as they do this day, both for their own continuance in Judaism, and for denying the gentiles to be the church of God. Gen 15:6