Parallel
Exodus 9:7
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
And Pharaoh sent, and, behold, there was not one of the cattle of the Israelites dead. And the heart of Pharaoh was hardened, and he did not let the people go.
Pharaoh sent officials and found that none of the livestock of the Israelites had died. But Pharaoh’s heart was hardened (note: Or made heavy; also in verse 34), and he would not let the people go.