Acts 7:22

So Moses was educated in all the Egyptian culture; he was strong in speech and action.

1 Corinthians 2:1-4

So when I came to you, brothers, I did not come and tell you the secret purpose of God in superior, philosophical language,

2 Corinthians 10:10

For they say, "His letters are impressive and telling, but his personal appearance is insignificant and as a speaker he amounts to nothing."

2 Corinthians 11:6

Even if I have no particular gifts in speaking, I am not wanting in knowledge. Why, I have always made that perfectly clear in my dealings with 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
So when I came to you, brothers, I did not come and tell you the secret purpose of God in superior, philosophical language,
2 Corinthians 10:10
For they say, "His letters are impressive and telling, but his personal appearance is insignificant and as a speaker he amounts to nothing."
2 Corinthians 11:6
Even if I have no particular gifts in speaking, I am not wanting in knowledge. Why, I have always made that perfectly clear in my dealings with you.