Exodus 10:1-2

And Yahweh said to Moses, “Go to Pharaoh, for I have made his heart insensitive and the heart of his servants in order to put these signs of mine in his midst, so that you will tell in the ears of your child and your grandchild that I dealt harshly with the Egyptians and so that you will tell about my signs that I have done among them, and so you will know that I am Yahweh.”