Exodus 4:10
Moses said to Yahweh, "O Lord, I am not eloquent, neither before now, nor since you have spoken to your servant; for I am slow of speech, and of a slow tongue."
Exodus 6:12
Moses spoke before Yahweh, saying, "Behold, the children of Israel haven't listened to me. How then shall Pharaoh listen to me, who am of uncircumcised lips?"
Jeremiah 1:6
Then I said, "Ah, Lord Yahweh! Behold, I don't know how to speak; for I am a child."
Exodus 4:1
Moses answered, "But, behold, they will not believe me, nor listen to my voice; for they will say, 'Yahweh has not appeared to you.'"
Acts 7:22
Moses was instructed in all the wisdom of the Egyptians. He was mighty in his words and works.
Job 12:2
"No doubt, but you are the people, and wisdom shall die with you.
1 Corinthians 2:1-4
When I came to you, brothers, I didn't come with excellence of speech or of wisdom, proclaiming to you the testimony of God.
2 Corinthians 10:10
For, "His letters," they say, "are weighty and strong, but his bodily presence is weak, and his speech is despised."
2 Corinthians 11:6
But though I am unskilled in speech, yet I am not unskilled in knowledge. No, in every way we have been revealed to you in all things.