Exodus 4:10
“Please, Lord,” Moses replied, “I have never been eloquent, neither in the past nor since You have spoken to Your servant, for I am slow of speech and tongue.”

Isaiah 6:5-8
Then I said: “Woe is me, for I am ruined, because I am a man of unclean lips dwelling among a people of unclean lips; for my eyes have seen the King, the LORD of Hosts.” / Then one of the seraphim flew to me, and in his hand was a glowing coal that he had taken with tongs from the altar. / And with it he touched my mouth and said: “Now that this has touched your lips, your iniquity is removed and your sin is atoned for.” ...

Judges 6:15
“Please, my Lord,” Gideon replied, “how can I save Israel? Indeed, my clan is the weakest in Manasseh, and I am the youngest in my father’s house.”

1 Kings 3:7
And now, O LORD my God, You have made Your servant king in my father David’s place. But I am only a little child, not knowing how to go out or come in.

Isaiah 49:1-5
Listen to Me, O islands; pay attention, O distant peoples: The LORD called Me from the womb; from the body of My mother He named Me. / He made My mouth like a sharp sword; He hid Me in the shadow of His hand. He made Me like a polished arrow; He hid Me in His quiver. / He said to Me, “You are My Servant, Israel, in whom I will display My glory.” ...

Acts 7:22
So Moses was educated in all the wisdom of the Egyptians and was powerful in speech and action.

1 Corinthians 2:1-4
When I came to you, brothers, I did not come with eloquence or wisdom as I proclaimed to you the testimony about God. / For I resolved to know nothing while I was with you except Jesus Christ and Him crucified. / I came to you in weakness and fear, and with much trembling. ...

2 Corinthians 3:5-6
Not that we are competent in ourselves to claim that anything comes from us, but our competence comes from God. / And He has qualified us as ministers of a new covenant, not of the letter but of the Spirit; for the letter kills, but the Spirit gives life.

Exodus 3:11
But Moses asked God, “Who am I, that I should go to Pharaoh and bring the Israelites out of Egypt?”

Jonah 1:2-3
“Get up! Go to the great city of Nineveh and preach against it, because its wickedness has come up before Me.” / Jonah, however, got up to flee to Tarshish, away from the presence of the LORD. He went down to Joppa and found a ship bound for Tarshish. So he paid the fare and went aboard to sail for Tarshish, away from the presence of the LORD.

Matthew 10:19-20
But when they hand you over, do not worry about how to respond or what to say. In that hour you will be given what to say. / For it will not be you speaking, but the Spirit of your Father speaking through you.

Luke 1:18
“How can I be sure of this?” Zechariah asked the angel. “I am an old man, and my wife is well along in years.”

Acts 4:13
When they saw the boldness of Peter and John and realized that they were unschooled, ordinary men, they marveled and took note that these men had been with Jesus.

1 Timothy 4:12
Let no one despise your youth, but set an example for the believers in speech, in conduct, in love, in faith, in purity.

Isaiah 50:4
The Lord GOD has given Me the tongue of discipleship, to sustain the weary with a word. He awakens Me morning by morning; He awakens My ear to listen as a disciple.