Exodus 9:12-14 New King James Version (NKJV)
12 But the Lord hardened the heart of Pharaoh; and he did not heed them, just as the Lord had spoken to Moses.
The Seventh Plague: Hail
13 Then the Lord said to Moses, “Rise early in the morning and stand before Pharaoh, and say to him, ‘Thus says the Lord God of the Hebrews: “Let My people go, that they may serve Me, 14 for at this time I will send all My plagues to your very heart, and on your servants and on your people, that you may know that there is none like Me in all the earth.
Exodus 9:12-14 New International Version (NIV)
12 But the Lord hardened Pharaoh’s heart and he would not listen to Moses and Aaron, just as the Lord had said to Moses.
The Plague of Hail
13 Then the Lord said to Moses, “Get up early in the morning, confront Pharaoh and say to him, ‘This is what the Lord, the God of the Hebrews, says: Let my people go, so that they may worship me, 14 or this time I will send the full force of my plagues against you and against your officials and your people, so you may know that there is no one like me in all the earth.