Exodus 3:19 ¶And I am sure that the king of Egypt will not let you go, no, not by a mighty hand.

Exodus 4:21 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.

Exodus 10:1 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:

Exodus 7:3 And I will harden Pharaoh's heart, and multiply my signs and my wonders in the land of Egypt.

Romans 9:16 So then it is not of him that willeth, nor of him that runneth, but of God that sheweth mercy.

Romans 9:17 For the scripture saith unto Pharaoh, Even for this same purpose have I raised thee up, that I might shew my power in thee, and that my name might be declared throughout all the earth.