Exodus 7:14

וַיֹּאמֶר יְהוָה אֶל מֹשֶׁה כָּבֵד לֵב פַּרְעֹה

King James Version (KJV)

And the LORD said unto Moses, Pharaoh's heart is hardened, he refuseth to let the people go.

Modern English

Yahweh said to Moses, “Pharaoh’s heart is stubborn. He refuses to let the people go.