Parallel
Exodus 8:15
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
But when Pharaoh saw that there was respite, he hardened his heart, and hearkened not unto them; as the Lord had said.
When Pharaoh saw that there was relief, however, he hardened (note: Or made heavy; also in verse 32) his heart and would not listen to Moses and Aaron, just as the LORD had said.