Exodus 6:30

But Moses said before the Lord, "Since I speak with difficulty, why should Pharaoh listen to me?"

Exodus 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 4:10

Then Moses said to the Lord, "O my Lord, I am not an eloquent man, neither in the past nor since you have spoken to your servant, for I am slow of speech and slow of tongue."

1 Corinthians 9:16-17

For if I preach the gospel, I have no reason for boasting, because I am compelled to do this. Woe to me if I do not preach the gospel!

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