Exodus 6:30

And Moses said before Jehovah, Behold, I am of uncircumcised lips, and how will Pharaoh hearken unto me?

Exodus 6:12

And Moses spoke before Jehovah, saying, Lo, the children of Israel do not hearken to me: how then should Pharaoh hearken to me, to me of uncircumcised lips?

Exodus 4:10

And Moses said to Jehovah, Ah Lord! I am not eloquent, neither heretofore nor since thou hast spoken to thy servant, for I am slow of speech and of a slow tongue.

1 Corinthians 9:16-17

For if I announce the glad tidings, I have nothing to boast of; for a necessity is laid upon me; for it is woe to me if I should not announce the glad tidings.

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