Exodus 9:14-17

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.