Exodus 9:12 in the World English Bible
The LORD hardened the heart of Pharaoh, and he didn’t listen to them, as the LORD had spoken to Moses.
Context
11 And the magicians could not stand before Moses because of the boils; for the boil was upon the magicians, and upon all the Egyptians.
12 And the LORD hardened the heart of Pharaoh, and he hearkened not unto them; as the LORD had spoken unto Moses.
13 And the LORD said unto Moses, Rise up early in the morning, and stand before Pharaoh, and say unto him, Thus saith the LORD God of the Hebrews, Let my people go, that they may serve me.