Exodus 6:30

And Moses said before Jehovah, Behold, I am of uncircumcised lips, and how shall Pharaoh listen to me?

Exodus 6:12

And Moses spoke before Jehovah, saying, Behold, the sons of Israel have not listened to me. How then shall Pharaoh hear me, since I have lips that are not circumcised?

Exodus 4:10

And Moses said to Jehovah, O my Lord, I am not a man of words now, nor since You have spoken to Your servant, but I am slow of speech and of a slow tongue.

1 Corinthians 9:16-17

For though I preach the gospel, no glory is to me. For necessity is laid on me; yea, woe is to me if I do not preach the gospel!

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