TSK
Treasury of Scripture Knowledge references in WEB.
Yahweh said to Moses, "When you go back into Egypt, see that you do before Pharaoh all the wonders which I have put in your hand, but I will harden his heart and he will not let the people go.
But Yahweh hardened Pharaoh's heart, and he didn't let the children of Israel go.
Yahweh hardened the heart of Pharaoh king of Egypt, and he pursued after the children of Israel; for the children of Israel went out with a high hand.
The fifth poured out his bowl on the throne of the beast, and his kingdom was darkened. They gnawed their tongues because of the pain,