1 Timothy 5:19

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

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.

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.

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 19:18-19

and the judges shall make thorough inquiry; and if the witness be a false witness, and he have testified falsely against his brother,

John 8:17

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

John 18:29

Pilate therefore went out to them and said, What accusation do ye bring against this man?

Acts 11:30

which also they did, sending it to the elders by the hand of Barnabas and Saul.

Acts 24:2-13

And he having been called, Tertullus began to accuse, saying, Seeing we enjoy great peace through thee, and that excellent measures are executed for this nation by thy forethought,

Acts 25:16

to whom I answered, It is not the custom of the Romans to give up any man before that the accused have the accusers face to face, and he have got opportunity of defence touching the charge.

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.

Titus 1:6

if any one be free from all charge against him, husband of one wife, having believing children not accused of excess or unruly.

Hebrews 10:28

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

Treasury of Scripture Knowledge

Summary

Against an elder receive not an accusation, but before two or three witnesses.

Bible References

Receive

John 18:29
Pilate therefore went out to them and said, What accusation do ye bring against this man?
Acts 24:2
And he having been called, Tertullus began to accuse, saying, Seeing we enjoy great peace through thee, and that excellent measures are executed for this nation by thy forethought,
Acts 25:16
to whom I answered, It is not the custom of the Romans to give up any man before that the accused have the accusers face to face, and he have got opportunity of defence touching the charge.
Titus 1:6
if any one be free from all charge against him, husband of one wife, having believing children not accused of excess or unruly.

Two

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 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.
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.
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.
Hebrews 10:28
Any one that has disregarded Moses' law dies without mercy on the testimony of two or three witnesses:

General references

Genesis 9:23
And Shem and Japheth took the upper garment and both laid it upon their shoulders, and went backwards, and covered the nakedness of their father. And their faces were turned away, that they saw not their father's nakedness.
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 13:14
then shalt thou inquire, and make search, and ask diligently; and if it be truth, and the thing be certain, that this abomination hath happened in the midst of thee,
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.