Exodus 6:30

And Moses said to the Lord, My lips are unclean; how is it possible that Pharaoh will give me a hearing?

Exodus 6:12

And Moses, answering the Lord, said, See, the children of Israel will not give ear to me; how then will Pharaoh give ear to me, whose lips are unclean?

Exodus 4:10

And Moses said to the Lord, O Lord, I am not a man of words; I have never been so, and am not now, even after what you have said to your servant: for talking is hard for me, and I am slow of tongue.

1 Corinthians 9:16-17

For if I am a preacher of the good news, I have no cause for pride in this; because I am forced to do so, for a curse is on me if I do not.

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