Exodus 9:35

And the heart of Pharao was hardened, and he did not send forth the children of Israel, as the Lord said to Moses.

And the heart of Pharaoh was hardened, neither would he let the children of Israel go; as the Lord had spoken by Moses.

The heart of Pharaoh was hardened, and he didn’t let the children of Israel go, just as Yahweh had spoken through Moses.