Matthew 18:16

But, if he do not hearken, take with thee, yet one or two, that, at the mouth of two witnesses or three, every declaration, maybe established;

Deuteronomy 19:15

One witness I shall not rise up, against a man for any iniquity, or for any sin, with regard to any sin that he may commit, - at the mouth of two witnesses or at the mouth of three witnesses, must a matter be establish.

John 8:17

And, in your own law, it is written, that, two men's witness, is, true:

2 Corinthians 13:1

This third time, am I coming unto you: - at the mouth of two witnesses, or three, shall every matter be established.

1 Timothy 5:19

Against an elder, entertain not, an accusation, except at, the mouth of two, or three, witnesses;

Hebrews 10:28

Any one having set aside a law of Moses, apart from compassions, upon the testimony of two or three witnesses, dieth:

Numbers 35:30

Whosoever taketh away life, at the mouth of witnesses, shall, the slayer be slain, - but, one witness, shall not testify against a person, to put him to death.

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.

1 Kings 21:13

Then came in the two reckless men, and sat before him, and the men bare witness against him, even against Naboth, before the people, saying, Naboth hath reviled God and king! So they carried him forth, outside the city, and stoned him with stones, that he died.

1 John 5:7-8

Because, three, are they who are bearing witness -

Revelation 11:3

And I will give unto my two witnesses, that they shall prophesy, a thousand two hundred and sixty days, arrayed in sackcloth.

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
Whosoever taketh away life, at the mouth of witnesses, shall, the slayer be slain, - but, one witness, shall not testify against a person, to put him to death.
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.
Deuteronomy 19:15
One witness I shall not rise up, against a man for any iniquity, or for any sin, with regard to any sin that he may commit, - at the mouth of two witnesses or at the mouth of three witnesses, must a matter be establish.
1 Kings 21:13
Then came in the two reckless men, and sat before him, and the men bare witness against him, even against Naboth, before the people, saying, Naboth hath reviled God and king! So they carried him forth, outside the city, and stoned him with stones, that he died.
John 8:17
And, in your own law, it is written, that, two men's witness, is, true:
2 Corinthians 13:1
This third time, am I coming unto you: - at the mouth of two witnesses, or three, shall every matter be established.
1 Timothy 5:19
Against an elder, entertain not, an accusation, except at, the mouth of two, or three, witnesses;
Hebrews 10:28
Any one having set aside a law of Moses, apart from compassions, upon the testimony of two or three witnesses, dieth:
1 John 5:7
Because, three, are they who are bearing witness -
Revelation 11:3
And I will give unto my two witnesses, that they shall prophesy, a thousand two hundred and sixty days, arrayed in sackcloth.

General references

Numbers 35:30
Whosoever taketh away life, at the mouth of witnesses, shall, the slayer be slain, - but, one witness, shall not testify against a person, to put him to death.
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.