Exodus 10:1-2

And JEHOVAH saith unto Moses, ‘Go in unto Pharaoh, for I have declared hard his heart, and the heart of his servants, so that I set these My signs in their midst, and so that thou recountest in the ears of thy son, and of thy son's son, that which I have done in Egypt, and My signs which I have set among them, and ye have known that I [am] JEHOVAH.’