Exodus 4:10
But Moses said to the LORD, "Oh, my Lord, I am not eloquent, either in the past or since you have spoken to your servant, but I am slow of speech and of tongue."
Exodus 6:12
But Moses said to the LORD, "Behold, the people of Israel have not listened to me. How then shall Pharaoh listen to me, for I am of uncircumcised lips?"
Jeremiah 1:6
Then I said, "Ah, Lord GOD! Behold, I do not know how to speak, for I am only a youth."
Exodus 4:1
Then Moses answered, "But behold, they will not believe me or listen to my voice, for they will say, 'The LORD did not appear to you.'"
Acts 7:22
And Moses was instructed in all the wisdom of the Egyptians, and he was mighty in his words and deeds.
Job 12:2
"No doubt you are the people, and wisdom will die with you.
1 Corinthians 2:1-4
And I, when I came to you, brothers,did not come proclaiming to you the testimony of God with lofty speech or wisdom.
2 Corinthians 10:10
For they say, "His letters are weighty and strong, but his bodily presence is weak, and his speech of no account."
2 Corinthians 11:6
Even if I am unskilled in speaking, I am not so in knowledge; indeed, in every way we have made this plain to you in all things.