Matthew 18:16

But if he does not listen to you, take one or two more with you, so that by the mouth of two or three witnesses every fact may be confirmed.

Deuteronomy 19:15

A single witness shall not rise up against a man on account of any iniquity or any sin which he has committed; on the evidence of two or three witnesses a matter shall be confirmed.

John 8:17

Even in your law it has been written that the testimony of two men is true.

2 Corinthians 13:1

This is the third time I am coming to you. Every fact is to be confirmed by the testimony of two or three witnesses.

1 Timothy 5:19

Do not receive an accusation against an elder except on the basis of two or three witnesses.

Hebrews 10:28

Anyone who has set aside the Law of Moses dies without mercy on the testimony of two or three witnesses.

Numbers 35:30

If anyone kills a person, the murderer shall be put to death at the evidence of witnesses, but no person shall be put to death on the testimony of one witness.

Deuteronomy 17:6

On the evidence of two witnesses or three witnesses, he who is to die shall be put to death; he shall not be put to death on the evidence of one witness.

1 Kings 21:13

Then the two worthless men came in and sat before him; and the worthless men testified against him, even against Naboth, before the people, saying, “Naboth cursed God and the king.” So they took him outside the city and stoned him to death with stones.

1 John 5:7-8

For there are three that testify:

Revelation 11:3

And I will grant authority to my two witnesses, and they will prophesy for twelve hundred and sixty days, clothed in sackcloth.”

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

That in

Numbers 35:30
If anyone kills a person, the murderer shall be put to death at the evidence of witnesses, but no person shall be put to death on the testimony of one witness.
Deuteronomy 17:6
On the evidence of two witnesses or three witnesses, he who is to die shall be put to death; he shall not be put to death on the evidence of one witness.
Deuteronomy 19:15
A single witness shall not rise up against a man on account of any iniquity or any sin which he has committed; on the evidence of two or three witnesses a matter shall be confirmed.
1 Kings 21:13
Then the two worthless men came in and sat before him; and the worthless men testified against him, even against Naboth, before the people, saying, “Naboth cursed God and the king.” So they took him outside the city and stoned him to death with stones.
John 8:17
Even in your law it has been written that the testimony of two men is true.
2 Corinthians 13:1
This is the third time I am coming to you. Every fact is to be confirmed by the testimony of two or three witnesses.
1 Timothy 5:19
Do not receive an accusation against an elder except on the basis of two or three witnesses.
Hebrews 10:28
Anyone who has set aside the Law of Moses dies without mercy on the testimony of two or three witnesses.
1 John 5:7
For there are three that testify:
Revelation 11:3
And I will grant authority to my two witnesses, and they will prophesy for twelve hundred and sixty days, clothed in sackcloth.”

General references

Numbers 35:30
If anyone kills a person, the murderer shall be put to death at the evidence of witnesses, but no person shall be put to death on the testimony of one witness.
Deuteronomy 17:6
On the evidence of two witnesses or three witnesses, he who is to die shall be put to death; he shall not be put to death on the evidence of one witness.