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