Matthew 18:16
but if he do not listen, take with thee one or two more; that by the mouth of two or three witnesses every word may be established.
2 Corinthians 13:1
This is the third time I am coming to you. In the mouth of two or three witnesses shall every word be established.
1 Timothy 5:19
Against an elder receive not an accusation without two or three witnesses.
Hebrews 10:28
He that hath set at nought the law of Moses dieth without mercy under two or three witnesses;
John 8:17-18
Moreover, it is written in your law, that the witness of two men is true.