Exodus 9:14-18

If you don’t, this time I will punish you, your officers, and your people, with all my power. Then you will know there is no one in the whole land like me. By now I could have used my power and caused a terrible disease that would have destroyed you and your people from the earth. But I have let you live for this reason: to show you my power so that my name will be talked about in all the earth. You are still against my people and do not want to let them go. So at this time tomorrow, I will send a terrible hailstorm, the worst in Egypt since it became a nation.