Matthew 18:16

But if he does not listen, take one or two more with you, that at the mouth of two or three witnesses every word may be established.

Deuteronomy 19:15

One witness shall not rise up against a man for any iniquity, or for any sin, in any sin that he sins: at the mouth of two witnesses, or at the mouth of three witnesses, shall a matter be established.

John 8:17

It's also written in your Law that the testimony of two people is valid.

2 Corinthians 13:1

This is the third time I am coming to you. "At the mouth of two or three witnesses shall every word be established."

1 Timothy 5:19

Do not receive an accusation against an elder, except at the word of two or three witnesses.

Hebrews 10:28

A man who disregards the Law of Moses dies without compassion on the word of two or three witnesses.

Numbers 35:30

"'Whoever kills any person, the murderer shall be slain at the mouth of witnesses: but one witness shall not testify against any person that he die.

Deuteronomy 17:6

At the mouth of two witnesses, or three witnesses, shall he who is to die be put to death; at the mouth of one witness he shall not be put to death.

1 Kings 21:13

The two men, the base fellows, came in and sat before him. The base fellows testified against him, even against Naboth, in the presence of the people, saying, "Naboth cursed God and the king." Then they carried him out of the city, and stoned him to death with stones.

1 John 5:7-8

For there are three who testify:

Revelation 11:3

I will give power to my two witnesses, and they will prophesy one thousand two hundred 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
"'Whoever kills any person, the murderer shall be slain at the mouth of witnesses: but one witness shall not testify against any person that he die.
Deuteronomy 17:6
At the mouth of two witnesses, or three witnesses, shall he who is to die be put to death; at the mouth of one witness he shall not be put to death.
Deuteronomy 19:15
One witness shall not rise up against a man for any iniquity, or for any sin, in any sin that he sins: at the mouth of two witnesses, or at the mouth of three witnesses, shall a matter be established.
1 Kings 21:13
The two men, the base fellows, came in and sat before him. The base fellows testified against him, even against Naboth, in the presence of the people, saying, "Naboth cursed God and the king." Then they carried him out of the city, and stoned him to death with stones.
John 8:17
It's also written in your Law that the testimony of two people is valid.
2 Corinthians 13:1
This is the third time I am coming to you. "At the mouth of two or three witnesses shall every word be established."
1 Timothy 5:19
Do not receive an accusation against an elder, except at the word of two or three witnesses.
Hebrews 10:28
A man who disregards the Law of Moses dies without compassion on the word of two or three witnesses.
1 John 5:7
For there are three who testify:
Revelation 11:3
I will give power to my two witnesses, and they will prophesy one thousand two hundred sixty days, clothed in sackcloth."

General references

Numbers 35:30
"'Whoever kills any person, the murderer shall be slain at the mouth of witnesses: but one witness shall not testify against any person that he die.
Deuteronomy 17:6
At the mouth of two witnesses, or three witnesses, shall he who is to die be put to death; at the mouth of one witness he shall not be put to death.