Contradiction with Exodus 10:11
Pharaoh initially agrees to let the people go and serve the Lord but then changes his mind, contradicting the command to let the Israelites serve the Lord.
Exodus 10:11: Not so: go now ye [that are] men, and serve the LORD; for that ye did desire. And they were driven out from Pharaoh's presence.
Contradiction with Exodus 9:12
God hardens Pharaoh's heart, preventing the Israelites from going, contradicting the previous willingness to let them go serve the Lord.
Exodus 9:12: And the LORD hardened the heart of Pharaoh, and he hearkened not unto them; as the LORD had spoken unto Moses.
Contradiction with Exodus 4:21
Again, it states God hardens Pharaoh’s heart, which contradicts any intent for an easy release as implied in Exodus 10:8.
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.
Contradiction with Exodus 14:4
God's plan is to harden Pharaoh’s heart further, contrasting with the initial offer of letting the people go in Exodus 10:8.
Exodus 14:4: And I will harden Pharaoh's heart, that he shall follow after them; and I will be honoured upon Pharaoh, and upon all his host; that the Egyptians may know that I [am] the LORD. And they did so.
Contradiction with 1 Samuel 15:29
God is not a man that he should change his mind, contradicting the indecision shown in letting the Israelites leave or not.
1 Samuel 15:29: And also the Strength of Israel will not lie nor repent: for he [is] not a man, that he should repent. [Strength: or, Eternity, or, Victory]