Classical material not listed by Torah Temimah under this passuk (EXTRA).
Core Text — EXTRA
וַיַּכְבֵּ֤ד פַּרְעֹה֙ אֶת־לִבּ֔וֹ גַּ֖ם בַּפַּ֣עַם הַזֹּ֑את וְלֹ֥א שִׁלַּ֖ח אֶת־הָעָֽם׃ {פ}
English: “And Pharaoh made his heart heavy” — \ldots of his own accord.