Exodus 6:30

But Moses said before the Lord, “Look, I am unskilled and inept in speech; how then will Pharaoh listen to me and pay attention to what I say?”

Exodus 6:12

But Moses said to the Lord, “Look, [my own people] the Israelites have not listened to me; so how then will Pharaoh listen to me, for I am unskilled and inept in speech?”

Exodus 4:10

Then Moses said to the Lord, “Please, Lord, I am not a man of words (eloquent, fluent), neither before nor since You have spoken to Your servant; for I am slow of speech and tongue.”

1 Corinthians 9:16-17

For if I [merely] preach the gospel, I have nothing to boast about, for I am compelled [that is, absolutely obligated to do it]. Woe to me if I do not preach the good news [of salvation]!

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