Exodus 9:14-16 For this time I will send all my plagues on you yourself, and on your servants and your people, so that you may know that there is none like me in all the earth. 15 For by now I could have put out my hand and struck you and your people with pestilence, and you would have been cut off from the earth. 16 But for this purpose I have raised you up, to show you my power, so that my name may be proclaimed in all the earth.
Exodus 10:1-2 Then the LORD said to Moses, “Go in to Pharaoh, for I have hardened his heart and the heart of his servants, that I may show these signs of mine among them, 2 and that you may tell in the hearing of your son and of your grandson how I have dealt harshly with the Egyptians and what signs I have done among them, that you may know that I am the LORD.”
Exodus 11:9 Then the LORD said to Moses, “Pharaoh will not listen to you, that my wonders may be multiplied in the land of Egypt.”
These are only a few examples.