Deuteronomy 19:15

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

Numbers 35:30

Whoever shall smite a person mortally, at the mouth of witnesses shall the murderer be put to death; but one witness shall not testify against a person to cause him to die.

Matthew 18:16

But if he do not hear thee, take with thee one or two besides, that every matter may stand upon the word of two witnesses or of three.

2 Corinthians 13:1

This third time I am coming to you. In the mouth of two or three witnesses shall every matter be established.

Deuteronomy 17:6

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

John 8:17

And in your law too it is written that the testimony of two men is true:

1 Timothy 5:19

Against an elder receive not an accusation unless where there are two or three witnesses.

Hebrews 10:28

Any one that has disregarded Moses' law dies without mercy on the testimony of two or three witnesses:

1 Kings 21:10

and set two men, sons of Belial, before him, and they shall bear witness against him saying, Thou didst curse God and the king; and carry him out, and stone him, that he may die.

1 Kings 21:13

And there came the two men, sons of Belial, and sat before him; and the men of Belial witnessed against him, against Naboth, in the presence of the people, saying, Naboth blasphemed God and the king. And they carried him forth out of the city, and stoned him with stones, that he died.

Matthew 26:60-61

And they found none, though many false witnesses came forward. But at the last two false witnesses came forward

Revelation 11:3-7

And I will give power to my two witnesses, and they shall 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 that is to die be put to death: he shall not be put to death at the mouth of one witness.
Numbers 35:30
Whoever shall smite a person mortally, at the mouth of witnesses shall the murderer be put to death; but one witness shall not testify against a person to cause him to die.
1 Kings 21:10
and set two men, sons of Belial, before him, and they shall bear witness against him saying, Thou didst curse God and the king; and carry him out, and stone him, that he may die.
Matthew 18:16
But if he do not hear thee, take with thee one or two besides, that every matter may stand upon the word of two witnesses or of three.
Matthew 26:60
And they found none, though many false witnesses came forward. But at the last two false witnesses came forward
John 8:17
And in your law too it is written that the testimony of two men is true:
2 Corinthians 13:1
This third time I am coming to you. In the mouth of two or three witnesses shall every matter be established.
1 Timothy 5:19
Against an elder receive not an accusation unless where there are two or three witnesses.
Hebrews 10:28
Any one that has disregarded Moses' law dies without mercy on the testimony of two or three witnesses:
Revelation 11:3
And I will give power to my two witnesses, and they shall prophesy a thousand two hundred and sixty days, clothed in sackcloth.

General references

Numbers 35:30
Whoever shall smite a person mortally, at the mouth of witnesses shall the murderer be put to death; but one witness shall not testify against a person to cause him to die.
Deuteronomy 17:6
At the mouth of two witnesses, or three witnesses, shall he that 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 before it have first heard from himself, and know what he does?