Matthew 18:16

But if he will not give ear to you, take with you one or two more, that by the lips of two or three witnesses every word may be made certain.

Deuteronomy 19:15

One witness may not make a statement against a man in relation to any sin or wrongdoing which he has done: on the word of two or three witnesses a question is to be judged.

John 8:17

Even in your law it is said that the witness of two men is true.

2 Corinthians 13:1

This is the third time that I am coming to you. From the mouth of two or three witnesses will every word be made certain.

1 Timothy 5:19

Do not take as true any statement made against one in authority, but only if two or three give witness to it.

Hebrews 10:28

A man who has gone against the law of Moses is put to death without pity on the word of two or three witnesses:

Numbers 35:30

Anyone causing the death of another is himself to be put to death on the word of witnesses: but the word of one witness is not enough.

Deuteronomy 17:6

On the word of two or three witnesses, a man may be given the punishment of death; but he is not to be put to death on the word of one witness.

1 Kings 21:13

And the two good-for-nothing persons came in and took their seats before him and gave witness against Naboth, in front of the people, saying, Naboth has been cursing God and the king. Then they took him outside the town and had him stoned to death.

1 John 5:7-8

And the Spirit is the witness, because the Spirit is true.

Revelation 11:3

And I will give orders to my two witnesses, and they will be prophets for a thousand, two hundred and sixty days, clothed with haircloth.

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
Anyone causing the death of another is himself to be put to death on the word of witnesses: but the word of one witness is not enough.
Deuteronomy 17:6
On the word of two or three witnesses, a man may be given the punishment of death; but he is not to be put to death on the word of one witness.
Deuteronomy 19:15
One witness may not make a statement against a man in relation to any sin or wrongdoing which he has done: on the word of two or three witnesses a question is to be judged.
1 Kings 21:13
And the two good-for-nothing persons came in and took their seats before him and gave witness against Naboth, in front of the people, saying, Naboth has been cursing God and the king. Then they took him outside the town and had him stoned to death.
John 8:17
Even in your law it is said that the witness of two men is true.
2 Corinthians 13:1
This is the third time that I am coming to you. From the mouth of two or three witnesses will every word be made certain.
1 Timothy 5:19
Do not take as true any statement made against one in authority, but only if two or three give witness to it.
Hebrews 10:28
A man who has gone against the law of Moses is put to death without pity on the word of two or three witnesses:
1 John 5:7
And the Spirit is the witness, because the Spirit is true.
Revelation 11:3
And I will give orders to my two witnesses, and they will be prophets for a thousand, two hundred and sixty days, clothed with haircloth.

General references

Numbers 35:30
Anyone causing the death of another is himself to be put to death on the word of witnesses: but the word of one witness is not enough.
Deuteronomy 17:6
On the word of two or three witnesses, a man may be given the punishment of death; but he is not to be put to death on the word of one witness.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain