Exodus 9:14-17

If you don’t, I will send more plagues on you and your officials and your people. Then you will know that there is no one like me in all the earth. By now I could have lifted my hand and struck you and your people with a plague to wipe you off the face of the earth. But I have spared you for a purpose—to show you my power and to spread my fame throughout the earth. But you still lord it over my people and refuse to let them go.