Exodus 7:13

"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."

"But when Pharaoh saw that there was respite, he hardened his heart, and hearkened not unto them; as the LORD had said."

"But after thy hardness and impenitent heart treasurest up unto thyself wrath against the day of wrath and revelation of the righteous judgment of God;"

"But the LORD hardened Pharaoh's heart, and he would not let them go."

"And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient; a reprobate...: or, a mind void of judgment or, an unapproving mind"

"But the LORD hardened Pharaoh's heart, so that he would not let the children of Israel go."

"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 exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin."