Exodus 9:14-18

For this time I am going to send all My plagues on you and your servants and your people, so that you may know that there is no one like Me in all the earth.

For had I now put out My hand and struck you and your people with plague, you would then have been eliminated from the earth.

But indeed, for this reason I have allowed you to remain, in order to show you My power and in order to proclaim My name throughout the earth.

Still you exalt yourself against My people by not letting them go. The Plague of Hail

Behold, about this time tomorrow, I will send a very heavy hail, such as has not been seen in Egypt from the day it was founded until now.