Testify against him that which is wrong - Margin, more literally, “a falling away.” The word is used Deuteronomy 13:5 to signify apostasy or revolt; here it is no doubt to be understood in the wider sense of any departure from the Law.
Related Commentaries of Deuteronomy 19:16
Deuteronomy 19:16
16 If a false witness rise up against any man to testify against him that which is wrong;