Matthew 18:16

But if he will not hear thee, take with thee one or two more, that by the mouth of two or three witnesses every word may be confirmed.

2 Corinthians 13:1

THIS third time I am coming to you: by the mouth of two or three witnesses shall every charge be established.

1 Timothy 5:19

Against a presbyter receive not an accusation, except it be from two or three witnesses.

Hebrews 10:28

Any man who treated the law of Moses with neglect, was put to death, without mercy, on the deposition of two or three witnesses:

John 8:17-18

Now even in your law it is written, that the testimony of two men is true.

Treasury of Scripture Knowledge

Summary

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

Bible References

General references

Matthew 18:16
But if he will not hear thee, take with thee one or two more, that by the mouth of two or three witnesses every word may be confirmed.
John 8:17
Now even in your law it is written, that the testimony of two men is true.
2 Corinthians 13:1
THIS third time I am coming to you: by the mouth of two or three witnesses shall every charge be established.
1 Timothy 5:19
Against a presbyter receive not an accusation, except it be from two or three witnesses.
Hebrews 10:28
Any man who treated the law of Moses with neglect, was put to death, without mercy, on the deposition of two or three witnesses: