Exodus 6:30

And Moses will say before Jehovah, Behold, I of uncircumcised lips; and how shall Pharaoh hear to me?

Exodus 6:12

And Moses will speak before Jehovah, saying, Behold, the sons of Israel heard not to me; and how shall Pharaoh hear me, and I of uncircumcised lips?

Exodus 4:10

And Moses will say to Jehovah, With leave my Lord, not a man of words, also from yesterday, also from the third day, also from the time of thy speaking to thy servant; for I being heavy of mouth, and heavy of tongue.

1 Corinthians 9:16-17

For if I announce the good news, there is no boasting to me: for necessity is laid upon me; and woe is to me, if I announce not the good news!

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