Exodus 9:14 (KJV)

And the Lord hardened the heart of Pharaoh, and he hearkened not unto them; as the Lord had spoken unto Moses.

And the Lord said unto Moses, Rise up early in the morning, and stand before Pharaoh, and say unto him, Thus saith the Lord God of the Hebrews, Let my people go, that they may serve me.

For I will at this time send all my plagues upon thine heart, and upon thy servants, and upon thy people; that thou mayest know that there is none like me in all the earth.

For now I will stretch out my hand, that I may smite thee and thy people with pestilence; and thou shalt be cut off from the earth.

And in very deed for this cause have I raised thee up, for to shew in thee my power; and that my name may be declared throughout all the earth.