Exodus 7:14
“And the Lord said unto Moses, Pharaoh’s heart is hardened, he refuseth to let the people go.”
For they cast down every man his rod, and they became serpents: but Aaron’s rod swallowed up their rods.
And he hardened Pharaoh’s heart, that he hearkened not unto them; as the Lord had said.
And the Lord said unto Moses, Pharaoh’s heart is hardened, he refuseth to let the people go.
Get thee unto Pharaoh in the morning; lo, he goeth out unto the water; and thou shalt stand by the river’s brink against he come; and the rod which was turned to a serpent shalt thou take in thine hand.
And thou shalt say unto him, The Lord God of the Hebrews hath sent me unto thee, saying, Let my people go, that they may serve me in the wilderness: and, behold, hitherto thou wouldest not hear.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Related Verses
“And he hardened Pharaoh’s heart, that he hearkened not unto them; as the Lord had said.”
“And the heart of Pharaoh was hardened, neither would he let the children of Israel go; as the Lord had spoken by Moses.”
“And the Lord said unto Moses, Go in unto Pharaoh: for I have hardened his heart, and the heart of his servants, that I might shew these my signs before him:”
“But the Lord hardened Pharaoh’s heart, so that he would not let the children of Israel go.”
“And the Lord said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go.”