Deuteronomy 17:6
{On the evidence of} two or three witnesses {the person shall be put to death}. The person shall not be put to death by the mouth of one witness.
Numbers 35:30
" 'If anyone kills a person, the killer will be put to death {according to the testimony} of witnesses, but someone cannot die on testimony of one person.
Deuteronomy 19:15
{The testimony of a single witness may not be used to convict} [with respect to] any crime and for any wrongdoing in any offense that a person committed; on the {evidence} of two witnesses or on the {evidence} of three witnesses {a charge shall be sustained}.
Matthew 18:16
But if he does not listen, take with you in addition one or two [others], so that by {the testimony} of two or three witnesses every matter may be established.
2 Corinthians 13:1
This [is] the third [time] I am coming to you. {By the testimony} of two or three witnesses every word will be established.
1 Timothy 5:19
Do not accept an accusation against an elder except on the evidence of two or three witnesses.
Hebrews 10:28
Anyone who rejected the law of Moses dies without mercy on [the testimony of] two or three witnesses.
John 8:17-18
And even in your law it is written that the testimony of two men is true.