Deuteronomy 19:18

Overview - Deuteronomy 19
1	The cities of refuge.
4	The privilege thereof for the manslayer.
14	The land-mark is not to be removed.
15	Two witnesses at the least are required.
16	The punishment of a false witness.

Deuteronomy 19:18  (King James Version)
And the judges shall make diligent inquisition: and, behold, if the witness be a false witness, and hath testified falsely against his brother;