Exodus 8:1

"And Jehovah spake unto Moses, Go in unto Pharaoh, and say unto him, Thus saith Jehovah, Let my people go, that they may serve me."

Bishop Usher who developed the well-known chronology dated all of the Ten Plagues within the space of a month, and, although that appears to be inaccurate, nevertheless, the impression prevails that they did occur in quick succession. "With Pharaoh scorning the first demonstration, Moses and Aaron bring, in swift succession, a series of disasters upon Egypt."[1] The contest in these overwhelming demonstrations was clearly a war between the true God Jehovah and Pharaoh himself a pagan deity and acknowledged head of the complex paganism of ancient Egypt. God's people had been serving Pharaoh, but now God demanded that His people serve Jehovah! "Let my people go, that they may serve me."