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 the matter be made sure.

Numbers 35:30

Whoever kills any person, the murderer shall be put to death by the mouth of witnesses. But one witness shall not testify against any person to cause him to die.

Matthew 18:16

But if he will not hear you, take one or two more with you, so that in the mouth of two or three witnesses every word may be established.

2 Corinthians 13:1

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

Deuteronomy 17:6

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

John 8:17

It is also written in your Law that the testimony of two men is true.

1 Timothy 5:19

Do not receive an accusation against an elder except before two or three witnesses.

Hebrews 10:28

He who despised Moses' Law died without mercy on the word of two or three witnesses.

1 Kings 21:10

And set two men, sons of Belial, before him to bear witness against him, saying, You blasphemed God and the king. And carry him out and stone him so that he may die.

1 Kings 21:13

And there came in 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 out of the city and stoned him with stones so that he died.

Matthew 26:60-61

But they found none; yea, though many false witnesses came, they found none. But at last two false witnesses came up

Revelation 11:3-7

And I will give power 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 that is worthy of death be put to death. At the mouth of one witness he shall not be put to death.
Numbers 35:30
Whoever kills any person, the murderer shall be put to death by the mouth of witnesses. But one witness shall not testify against any person to cause him to die.
1 Kings 21:10
And set two men, sons of Belial, before him to bear witness against him, saying, You blasphemed God and the king. And carry him out and stone him so that he may die.
Matthew 18:16
But if he will not hear you, take one or two more with you, so that in the mouth of two or three witnesses every word may be established.
Matthew 26:60
But they found none; yea, though many false witnesses came, they found none. But at last two false witnesses came up
John 8:17
It is also written in your Law that the testimony of two men is true.
2 Corinthians 13:1
I am coming to you this third time. In the mouth of two or three witnesses every word shall be established.
1 Timothy 5:19
Do not receive an accusation against an elder except before two or three witnesses.
Hebrews 10:28
He who despised Moses' Law died without mercy on the word of two or three witnesses.
Revelation 11:3
And I will give power 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 put to death by the mouth of witnesses. But one witness shall not testify against any person to cause him to die.
Deuteronomy 17:6
At the mouth of two witnesses or three witnesses shall he that is worthy of death be put to death. At the mouth of one witness he shall not be put to death.
John 7:51
Does our law judge the Man before it hears Him and knows what He does?