That the World May Know: Volume 8, God Heard Their Cry-Faith Lesson 3, Finger of God: The Plagues

God acted against the gods of Egypt to show His power - to Israel, to Egypt, to Pharaoh - so that they and ultimately all of the world would know that He is the one and only God. Pharaoh had seen who God was, but hardened his heart. The Hebrews saw who God was and, in grateful worship, left Egypt behind and submitted to God's invitation to join His story and fulfill His purpose.