Exodus 6:30

And Moses saith before Jehovah, 'Lo, I am of uncircumcised lips, and how doth Pharaoh hearken unto me?'

Exodus 6:12

and Moses speaketh before Jehovah, saying, 'Lo, the sons of Israel have not hearkened unto me, and how doth Pharaoh hear me, and I of uncircumcised lips?'

Exodus 4:10

And Moses saith unto Jehovah, 'O, my Lord, I am not a man of words, either yesterday, or before, or since Thy speaking unto Thy servant, for I am slow of mouth, and slow of tongue.'

1 Corinthians 9:16-17

for if I may proclaim good news, it is no glorying for me, for necessity is laid upon me, and woe is to me if I may not proclaim good news;

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