Deuteronomy 19:18

And the judges shall make diligent inquisition ,.... Into the case before them, into the nature of the evidence and proof that each witness brings for or against; so the Targum of Jonathan,"the judges shall interrogate the witness, by whom these things are said, well;'shall thoroughly examine the testimony given, and look carefully into it:

and, behold, if the witness be a false witness, and hath testified falsely against his brother ; it appears plainly by full evidence that he has testified a falsehood of him.