Exodus 7:2-4

New Century Version

² Tell Aaron your brother everything that I command you, and let him tell the king of Egypt to let the Israelites leave his country. ³ But I will make the king stubborn. I will do many miracles in Egypt, ⁴ but he will still refuse to listen. So then I will punish Egypt terribly, and I will lead my divisions, my people the Israelites, out of that land.