Exodus 9:35 in the World English Bible
The heart of Pharaoh was hardened, and he didn’t let the children of Israel go, just as the LORD had spoken through Moses.
Context
34 And when Pharaoh saw that the rain and the hail and the thunders were ceased, he sinned yet more, and hardened his heart, he and his servants.
35 And the heart of Pharaoh was hardened, neither would he let the children of Israel go; as the LORD had spoken by Moses.