In this chapter,

I. Moses applies himself to the execution of his commission, ver. 1-7.

II. The dispute between Moses and Pharaoh begins. 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.

1. Moses confirms the demand he made to Pharaoh by a miracle, turning his rod into a serpent, but Pharaoh hardens his heart, ver. 8-13.

2. He chastiseth his disobedience by a plague, the first of ten, turning the waters into blood; but Pharaoh hardens his heart again, ver. 14-25.