Parallel
Exodus 9:7
Brenton's English Septuagint · Berean Standard Bible
And when Pharao saw, that of all the cattle of the children of Israel there died not one, the heart of Pharao 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.