Exodus 9:12-14 New Revised Standard Version Catholic Edition (NRSVCE)
12 But the Lord hardened the heart of Pharaoh, and he would not listen to them, just as the Lord had spoken to Moses.
The Seventh Plague: Thunder and Hail
13 Then the Lord said to Moses, “Rise up early in the morning and present yourself before Pharaoh, and say to him, ‘Thus says the Lord, the God of the Hebrews: Let my people go, so that they may worship me. 14 For this time I will send all my plagues upon you yourself, and upon your officials, and upon your people, so that you may know that there is no one like me in all the earth.