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.

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 so that he dies.

Matthew 18:16

But if he should not hear, take with thee one or two besides, so that at the mouth of two or three witnesses every word may be established.

2 Corinthians 13:1

This third time I am coming to you. In the mouth of two witnesses or three every saying will be confirmed.

Deuteronomy 17:6

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

John 8:17

And also it is written in your law that the testimony of two men is valid.

1 Timothy 5:19

Accept no accusation against an elder, except at two or three witnesses.

Hebrews 10:28

Any man who has disregarded the law of Moses dies without mercies from two or three witnesses.

1 Kings 21:10

And set two men, base fellows, before him, and let them bear witness against him, saying, Thou cursed God and the king. And then carry him out, and stone him to death.

1 Kings 21:13

And the two men, the base fellows, came in and sat before him. And the base fellows bore witness against him, even against Naboth, in the presence of the people, saying, Naboth cursed God and the king. Then they carried him forth o

Matthew 26:60-61

and they did not find it. And although many FALSE witnesses came, they did not find it.

Revelation 11:3-7

And I will give to my two witnesses, and they will prophesy a thousand two hundred and sixty days clothed in sackcloth.

Treasury of Scripture Knowledge

Summary

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

Bible References

At the mouth

Deuteronomy 17:6
At the mouth of two witnesses, or three witnesses, shall he who is to die be put to death. He shall not be put to death at the mouth of one witness.
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 so that he dies.
1 Kings 21:10
And set two men, base fellows, before him, and let them bear witness against him, saying, Thou cursed God and the king. And then carry him out, and stone him to death.
Matthew 18:16
But if he should not hear, take with thee one or two besides, so that at the mouth of two or three witnesses every word may be established.
Matthew 26:60
and they did not find it. And although many FALSE witnesses came, they did not find it.
John 8:17
And also it is written in your law that the testimony of two men is valid.
2 Corinthians 13:1
This third time I am coming to you. In the mouth of two witnesses or three every saying will be confirmed.
1 Timothy 5:19
Accept no accusation against an elder, except at two or three witnesses.
Hebrews 10:28
Any man who has disregarded the law of Moses dies without mercies from two or three witnesses.
Revelation 11:3
And I will give to my two witnesses, and they will prophesy a thousand two hundred and 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 so that he dies.
Deuteronomy 17:6
At the mouth of two witnesses, or three witnesses, shall he who is to die be put to death. He shall not be put to death at the mouth of one witness.
John 7:51
Does our law judge a man, unless it first may hear from himself and know what he does?