Exodus 4:10

And Moses saith unto Jehovah, 'O, my Lord, I am not a man of words, either yesterday, or before, or since Thy speaking unto Thy servant, for I am slow of mouth, and slow of tongue.'

Exodus 6:12

and Moses speaketh before Jehovah, saying, 'Lo, the sons of Israel have not hearkened unto me, and how doth Pharaoh hear me, and I of uncircumcised lips?'

Jeremiah 1:6

And I say, 'Ah, Lord Jehovah! lo, I have not known -- to speak, for I am a youth.'

Exodus 4:1

And Moses answereth and saith, 'And, if they do not give credence to me, nor hearken to my voice, and say, Jehovah hath not appeared unto thee?'

Acts 7:22

and Moses was taught in all wisdom of the Egyptians, and he was powerful in words and in works.

Job 12:2

Truly -- ye are the people, And with you doth wisdom die.

1 Corinthians 2:1-4

And I, having come unto you, brethren, came -- not in superiority of discourse or wisdom -- declaring to you the testimony of God,

2 Corinthians 10:10

because the letters indeed -- saith one -- are weighty and strong, and the bodily presence weak, and the speech despicable.'

2 Corinthians 11:6

and even if unlearned in word -- yet not in knowledge, but in every thing we were made manifest in all things to you.

Treasury of Scripture Knowledge

Summary

And Moses said unto the LORD, O my Lord, I am not eloquent, neither heretofore, nor since thou hast spoken unto thy servant: but I am slow of speech, and of a slow tongue.

General references

Bible References

Eloquent

Exodus 4:1
And Moses answereth and saith, 'And, if they do not give credence to me, nor hearken to my voice, and say, Jehovah hath not appeared unto thee?'
Job 12:2
Truly -- ye are the people, And with you doth wisdom die.
1 Corinthians 2:1
And I, having come unto you, brethren, came -- not in superiority of discourse or wisdom -- declaring to you the testimony of God,
2 Corinthians 10:10
because the letters indeed -- saith one -- are weighty and strong, and the bodily presence weak, and the speech despicable.'
2 Corinthians 11:6
and even if unlearned in word -- yet not in knowledge, but in every thing we were made manifest in all things to you.

General references

Exodus 3:11
And Moses saith unto God, 'Who am I, that I go unto Pharaoh, and that I bring out the sons of Israel from Egypt?'
Judges 4:8
And Barak saith unto her, 'If thou dost go with me, then I have gone; and if thou dost not go with me, I do not go;'
Judges 7:10
and if thou art afraid to go down -- go down, thou and Phurah thy young man, unto the camp,