Parallel
Exodus 10:20
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
But the Lord hardened Pharaoh’s heart, so that he would not let the children of Israel go.
But the LORD hardened (note: Or stiffened or strengthened; also in verse 27) Pharaoh’s heart, and he would not let the Israelites go.