The whole truth and nothing but the truth?

What does the Bible say about telling the whole truth and nothing but the truth?  NOTE IN A COURT OF LAW I AM SURE GOD intends that peope tell the whole truth.  But some think this phrase said in court came from the Bible. I didn't realize this thought from the Bible until 2009.
 KJV Proverbs 29:11  A fool uttereth all his mind: but a wise man keepeth it in till afterwards.
***Some things are no one's business but your own and God.