Parallel
Exodus 10:20
Berean Standard Bible · Westminster Leningrad Codex
But the LORD hardened (note: Or stiffened or strengthened; also in verse 27) Pharaoh’s heart, and he would not let the Israelites go.
וַיְחַזֵּ֥ק יְהוָ֖ה אֶת־ לֵ֣ב פַּרְעֹ֑ה וְלֹ֥א שִׁלַּ֖ח אֶת־ בְּנֵ֥י יִשְׂרָאֵֽל׃פ