Exodus 4:10
And Moses said to Yahweh, "Please, Lord, I [am] not a man of words, {neither recently nor in the past nor since your speaking} to your servant, because I [am] heavy of mouth and of tongue."
Exodus 6:12
And Moses spoke before Yahweh, saying, "Look, the {Israelites} do not listen to me, and how will Pharaoh listen to me, since I [am] {a poor speaker}?"
Jeremiah 1:6
Then I said, "Ah, Lord Yahweh! Look, I do not know [how] to speak, for I [am] a youth."
Exodus 4:1
And Moses answered, and he said, "And if they do not believe me and they do not listen to my voice, but they say, 'Yahweh did not appear to you?'"
Acts 7:22
And Moses was educated in all the wisdom of the Egyptians, and was powerful in his words and deeds.
Job 12:2
"Truly indeed 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 with superiority of speech or of wisdom, proclaiming to you the testimony of God.
2 Corinthians 10:10
because it is said, "His letters [are] severe and powerful, but his bodily presence [is] weak and his speech is of no account."
2 Corinthians 11:6
But even if [I am] unskilled in speech, yet [I am] not in knowledge; certainly in everything [we] have made this clear to you in every [way].