Exodus 8:32 in the King James Version
And Pharaoh hardened his heart at this time also, neither would he let the people go.
Context
31 The LORD did according to the word of Moses, and he removed the swarms of flies from Pharaoh, from his servants, and from his people. There remained not one.
32 Pharaoh hardened his heart this time also, and he didn’t let the people go.