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 spoke before the LORD, saying, Behold, the children of Israel have not hearkened unto me; how then shall Pharaoh hear me, who am of uncircumcised lips?

Exodus 4:10

And Moses said unto the LORD, O my Lord, I am not eloquent, neither before, nor since you have spoken unto your servant: but I am slow of speech, and of a slow tongue.

1 Corinthians 9:16-17

For though I preach the gospel, I have nothing to boast of: for necessity is laid upon me; yea, woe is unto me, if I preach not the gospel!

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