Verses with the word eloquent in the Old Testament (2 verses):

Exodus 4:10
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.

Isaiah 3:3
The captain of fifty, and the honourable man, and the counsellor, and the cunning artificer, and the eloquent orator.