Exodus 6:9

6:9 Moses told this to the Israelites, but they did not listen to him because of their discouragement and hard labor.

Exodus 6:30

6:30 But Moses said before the Lord, “Since I speak with difficulty, why should Pharaoh listen to me?”

Exodus 7:13

7:13 Yet Pharaoh’s heart became hard, and he did not listen to them, just as the Lord had predicted.