Acts 7:22

And Moses was instructed in all the wisdom of the Egyptians, and was mighty in his words and works.

1 Corinthians 2:1-4

And I, brethren, when I came to you, came not with excellency of speech or of wisdom, proclaiming to you the testimony of God;

2 Corinthians 10:10

because, "His letters, indeed," says one, "are weighty and strong, but his bodily presence is weak, and his speech contemptible."

2 Corinthians 11:6

And, though I be rude in speech, yet am I not rude in knowledge; but in every way having manifested it toward you in all things.

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 I, brethren, when I came to you, came not with excellency of speech or of wisdom, proclaiming to you the testimony of God;
2 Corinthians 10:10
because, "His letters, indeed," says one, "are weighty and strong, but his bodily presence is weak, and his speech contemptible."
2 Corinthians 11:6
And, though I be rude in speech, yet am I not rude in knowledge; but in every way having manifested it toward you in all things.