Exodus 6:30

And Moses said before the LORD, Behold, I am of uncircumcised lips, and how shall Pharaoh hearken unto me?

Exodus 6:12

And Moses answered before the LORD, saying, Behold, the sons of Israel do not hearken unto me; how then shall Pharaoh hear me, seeing I am of uncircumcised lips?

Exodus 4:10

Then Moses said unto the LORD, O my Lord, I am not eloquent, neither up until now, nor since thou hast spoken unto thy slave; but I am slow of speech and of a slow tongue.

1 Corinthians 9:16-17

For though I preach the gospel, I have no reason to glory, for it is an obligation laid upon me; for woe is me, if I do not preach the gospel!

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