Reference for Exodus 10:20

וַיְחַזֵּ֥ק יְהוָ֖ה אֶת־לֵ֣ב פַּרְעֹ֑ה וְלֹ֥א שִׁלַּ֖ח אֶת־בְּנֵ֥י יִשְׂרָאֵֽל׃ (פ)

But the LORD hardened Pharaoh’s heart, and he did not let the children of Israel go.

BDB

BDB