Pharaoh's heart is hardened— In the Hebrew, is made heavy: i.e. What was designed for his conviction, has proved the means only of aggravating his guilt, and rendering his stoney heart more heavy and obdurate.
Related Commentaries of Exodus 7:14
Exodus 7:14
14 And the LORD said unto Moses, Pharaoh's heart is hardened, he refuseth to let the people go.