Exodus 6:30

And Moses answered before the LORD, "I am of uncircumcised lips, how shall Pharaoh then give me audience?"

Exodus 6:12

And Moses spake before the LORD saying, "Behold, the children of Israel hearken not unto me; how then shall Pharaoh hear me, seeing that I have uncircumcised lips?"

Exodus 4:10

And Moses said unto the LORD, "O my Lord. I am not eloquent, no not in times past and namely since thou hast spoken unto thy servant: but I am slow mouthed and slow tongued."

1 Corinthians 9:16-17

In that I preach the gospel, I have nothing to rejoice of. For necessity is put unto me. Woe is it unto me if I preach not the gospel.

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