Parallel
Exodus 9:35
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
And the heart of Pharaoh was hardened, neither would he let the children of Israel go; as the Lord had spoken by Moses (note: Heb. by the hand of Moses).
So Pharaoh’s heart was hardened, and he would not let the Israelites go, just as the LORD had said through Moses.