For he saith to Moses,.... That is, God said to Moses. The apostle goes on to answer to the above objections, by producing some testimonies out of the writings of Moses, in favour of both branches of predestination; showing, that the doctrine he had advanced, was no other than what God himself had delivered to Moses, whose name and writings were in great esteem with the Jews, whereby the apostle might hope to give full satisfaction in this point.
The first passage he cites, is in Ex 33:19.And will be gracious to whom I will be gracious, and will show mercy on whom I will show mercy.