Matthew 18:16

But, if he does not listen to you, take with you one or two others, so that 'on the evidence of two or three witnesses, every word may be put beyond dispute.'

2 Corinthians 13:1

For the third time I am coming to see you. 'By the word of two or three witnesses each statement shall be established.'

1 Timothy 5:19

Do not receive a charge against an Officer of the Church, unless it is supported by two or three witnesses;

Hebrews 10:28

When a man disregarded the Law of Moses, he was, on the evidence of two or three witnesses, put to death without pity.

John 8:17-18

Why, in your own Law it is said that the testimony of two persons is trustworthy.

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 does not listen to you, take with you one or two others, so that 'on the evidence of two or three witnesses, every word may be put beyond dispute.'
John 8:17
Why, in your own Law it is said that the testimony of two persons is trustworthy.
2 Corinthians 13:1
For the third time I am coming to see you. 'By the word of two or three witnesses each statement shall be established.'
1 Timothy 5:19
Do not receive a charge against an Officer of the Church, unless it is supported by two or three witnesses;
Hebrews 10:28
When a man disregarded the Law of Moses, he was, on the evidence of two or three witnesses, put to death without pity.