Acts 7:22

So Moses was educated in all the learning of the Egyptians, and possessed great influence through his eloquence and his achievements.

1 Corinthians 2:1-4

And as for myself, brethren, when I came to you, it was not with surpassing power of eloquence or earthly wisdom that I came, announcing to you that which God had commanded me to bear witness to.

2 Corinthians 10:10

For they say "His letters are authoritative and forcible, but his personal presence is unimpressive, and as for eloquence, he has none."

2 Corinthians 11:6

And if in the matter of speech I am no orator, yet in knowledge I am not deficient. Nay, we have in every way made that fully evident 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.

Bible References

Eloquent

1 Corinthians 2:1
And as for myself, brethren, when I came to you, it was not with surpassing power of eloquence or earthly wisdom that I came, announcing to you that which God had commanded me to bear witness to.
2 Corinthians 10:10
For they say "His letters are authoritative and forcible, but his personal presence is unimpressive, and as for eloquence, he has none."
2 Corinthians 11:6
And if in the matter of speech I am no orator, yet in knowledge I am not deficient. Nay, we have in every way made that fully evident to you.