Matthew 18:16
But if he will not hear you, take with you one or two more, that, by the mouth of two or three witnesses, every word may be established.
2 Corinthians 13:1
The third time am I coming to you. By the mouth of two or three witnesses, every matter shall be established.
1 Timothy 5:19
Receive not an accusation against an old man, unless before two or three witnesses.
Hebrews 10:28
He that despised Moses law, died without mercy, on the testimony of two or three witnesses:
John 8:17-18
It is also written in your law, The testimony of two is worthy of credit.