וַיֶּחֱזַק֙ לֵ֣ב פַּרְעֹ֔ה וְלֹ֥א שָׁמַ֖ע אֲלֵהֶ֑ם כַּאֲשֶׁ֖ר דִּבֶּ֥ר יְהוָֽה׃ (פ)
And Pharaoh’s heart was hardened, and he hearkened not unto them; as the LORD had spoken.
Targum Jonathan on Exodus
And the disposition Pharoh's heart was hardened, and he would not hearken to them, as the Lord had said.