Exodus 9:13-14
13
Yahweh said to Moses, "Rise up early in the morning, and stand before Pharaoh, and tell him, 'This is what Yahweh, the God of the Hebrews, says: "Let my people go, that they may serve me.
14
For this time I will send all my plagues against your heart, against your officials, and against your people; that you may know that there is none like me in all the earth.