Deuteronomy 19:18-19

19:18 The judges will thoroughly investigate the matter, and if the witness should prove to be false and to have given false testimony against the accused, 19:19 you must do to him what he had intended to do to the accused. In this way you will purge evil from among you.

tn Heb “his brother” (also in the following verse).

tn Heb “you will burn out” (בִּעַרְתָּ, biarta). Like a cancer, unavenged sin would infect the whole community. It must, therefore, be excised by the purging out of its perpetrators who, presumably, remained unrepentant (cf. Deut 13:6; 17:7, 12; 21:21; 22:21-22, 24; 24:7).