Exodus 6:30

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

Exodus 6:12

6:12 But Moses replied to the Lord, “If the Israelites did not listen to me, then how will Pharaoh listen to me, since I speak with difficulty?”

Exodus 14:25

14:25 He jammed the wheels of their chariots so that they had difficulty driving, and the Egyptians said, “Let’s flee from Israel, for the Lord fights for them against Egypt!”