Ever Passover, I always wonder why Pharaoh could not believe Moses.
Here we see it in action.
Exodus 10
New International Version
The Plague of Locusts
10 Then the Lord said to Moses, “Go to Pharaoh, for I have hardened his heart and the hearts of his officials so that I may perform these signs of mine among them 2 that you may tell your children and grandchildren how I dealt harshly with the Egyptians and how I performed my signs among them, and that you may know that I am the Lord.”