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.

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.

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 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 19:18-19

And the judges will have the question looked into with care: and if the witness is seen to be false and to have made a false statement against his brother,

John 8:17

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

John 18:29

So Pilate came out to them and put the question: What have you to say against this man?

Acts 11:30

Which they did, sending it to the rulers of the church by the hand of Barnabas and Saul.

Acts 24:2-13

And when he had been sent for, Tertullus, starting his statement, said, Because by you we are living in peace, and through your wisdom wrongs are put right for this nation,

Acts 25:16

To whom I gave answer that it is not the Roman way to give a man up, till he has been face to face with those who are attacking him, and has had a chance to give an answer to the statements made against him.

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.

Titus 1:6

Men having a good record, husbands of one wife, whose children are of the faith, children of whom it may not be said that they are given to loose living or are uncontrolled.

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:

Treasury of Scripture Knowledge

Summary

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

Bible References

Receive

John 18:29
So Pilate came out to them and put the question: What have you to say against this man?
Acts 24:2
And when he had been sent for, Tertullus, starting his statement, said, Because by you we are living in peace, and through your wisdom wrongs are put right for this nation,
Acts 25:16
To whom I gave answer that it is not the Roman way to give a man up, till he has been face to face with those who are attacking him, and has had a chance to give an answer to the statements made against him.
Titus 1:6
Men having a good record, husbands of one wife, whose children are of the faith, children of whom it may not be said that they are given to loose living or are uncontrolled.

Two

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.
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.
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.
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:

General references

Genesis 9:23
And Shem and Japheth took a robe, and putting it on their backs went in with their faces turned away, and put it over their father so that they might not see him unclothed.
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 13:14
Then let a full search be made, and let questions be put with care; and if it is true and certain that such a disgusting thing has been done among you;
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