Deuteronomy 17:6-7

6 aOn the evidence of two witnesses or of three witnesses the one who is to die shall be put to death; a person shall not be put to death on the evidence of one witness. 7 bThe hand of the witnesses shall be first against him to put him to death, and afterward the hand of all the people. So cyou shall purge
Septuagint drive out; also verse 12
the evil
Or  evil person; also verse 12
from your midst.

Deuteronomy 19:15

Laws Concerning Witnesses

15“A single witness shall not suffice against a person for any crime or for any wrong in connection with any offense that he has committed. fOnly on the evidence of two witnesses or of three witnesses shall a charge be established.

Matthew 18:16

16But if he does not listen, take one or two others along with you, that every charge may be established gby the evidence of two or three witnesses.

John 8:17-18

17 hIn your Law it is written that the testimony of two people is true. 18I am the one who bears witness about myself, and ithe Father who sent me bears witness about me.”

2 Corinthians 13:1

Final Warnings

1 jThis is the third time I am coming to you. Every charge must be established kby the evidence of two or three witnesses.

1 Timothy 5:19

19Do not admit a charge against an elder except lon the evidence of two or three witnesses.
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