Acts 7:22

"So Moses was educated in all the wisdom of the Egyptians, and was mighty in his words and works.

1 Corinthians 2:1-4

And when I came to you, brothers, I came not to proclaim God's great secret purpose in fine language of philosophy;

2 Corinthians 10:10

"His letters indeed," says one, "are mighty and forcible, but his personality is weak, and his speech contemptible."

2 Corinthians 11:6

Yes, though I be unskilled in speech, at least I am not in knowledge; indeed I made this perfectly plain to you in all things and among all men.

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 when I came to you, brothers, I came not to proclaim God's great secret purpose in fine language of philosophy;
2 Corinthians 10:10
"His letters indeed," says one, "are mighty and forcible, but his personality is weak, and his speech contemptible."
2 Corinthians 11:6
Yes, though I be unskilled in speech, at least I am not in knowledge; indeed I made this perfectly plain to you in all things and among all men.