Deuteronomy 19:16-21

If a false witness rise up against any man to testify against him that which is wrong;

But if convicted of perjury, it will be sufficient for his own condemnation, and his punishment shall be exactly the same as would have overtaken the object of his malignant prosecution (see the notes at Exodus 21:24; Leviticus 24:20). No mawkish sentimentalism or misplaced pity was to be indulged toward a false accuser, whose heartless enmity could stimulate him so far as to swear away the property or the life of a neighbour. The law was to be inflexibly executed on a convicted slanderer, who should be doomed to suffer the penalty of the crime with which he maliciously charged another; and nothing was so likely to put an effectual arrest on such infamous attempts as the infliction of this retributive justice.