Ex 4:21

4:21 I will harden his heart. The Lord’s hardening of Pharaoh’s heart is a sovereign divine judgment on Pharaoh, who is also said to harden his own heart (8:15; Rom. 9:17, 18). God purposes to display His power over the stubborn hostility of the king so that His people might know that He is the Lord their deliverer (6:6–8).