Exodus 8:15

Then Pharaoh, seeing that relief had been provided, hardened his own heart, and he did not listen to them, just as the Lord had instructed

Other versions

King James Version

But when Pharaoh saw that there was respite, he hardened his heart, and hearkened not unto them; as the LORD had said.

English Standard Version

But when Pharaoh saw that there was a respite, he hardened his heart and would not listen to them, as the LORD had said.

New International Version

But when Pharaoh saw that there was relief, he hardened his heart and would not listen to Moses and Aaron, just as the LORD had said.