Exodus 11:10 in the King James Version
And Moses and Aaron did all these wonders before Pharaoh: and the LORD hardened Pharaoh’s heart, so that he would not let the children of Israel go out of his land.
Context
9 The LORD said to Moses, “Pharaoh won’t listen to you, that my wonders may be multiplied in the land of Egypt.”
10 Moses and Aaron did all these wonders before Pharaoh, but the LORD hardened Pharaoh’s heart, and he didn’t let the children of Israel go out of his land.