In this chapter, I. The dispute between God and Moses finishes, and Moses applies himself to the execution of his commission, in obedience to God's command (Exo 7:1-7). II. The dispute between Moses and Pharaoh begins, and a famous trial of skill it was. Moses, in God's name, demands Israel's release; Pharaoh denies it. The contest is between the power of the great God and the power of a proud prince; and it will be found, in the issue, that when God judgeth he will overcome. 1. Moses confirms the demand he had made to Pharaoh, by a miracle, turning his rod into a serpent; but Pharaoh hardens his heart against this conviction (Exo 7:8-13). 2. He chastises his disobedience by a plague, the first of the ten, turning the waters into blood; but Pharaoh hardens his heart against this correction, Exo 7:14, etc.).