One witness shall not rise up against a man for any iniquity, or for any sin, in any sin that he sinneth: at the mouth of two witnesses, or at the mouth of three witnesses, shall the matter be established. – Deuteronomy 19:15
But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established. – Matthew 18:16
This is the third time I am coming to you. In the mouth of two or three witnesses shall every word be established. – 2 Corinthians 13:1
The simple believeth every word: but the prudent man looketh well to his going. –Proverbs 14:15
The value of cross examination…
He that is first in his own cause seemeth just; but his neighbour cometh and searcheth him. – Proverbs 18:17
More References needed 🙂