For when] The Apostle proveth by the example of Abraham the father of the faithfull, what he had testified of all their faithfull forefathers in the precedent verse; and he maketh choice to instance in Abraham, because the substance of that promise made unto him, was made also to all his children according to promise; that is, to all the faithfull. Romans 9:8. he sware] Genesis 22:16-17.