Deuteronomy 27:24

Cursed [be] he that smiteth his neighbour secretly
And kills him, and the murder is not known; the curse of God follows such, and overtakes them sooner or later. Some interpret this of smiting with the tongue, of secret backbiting and slander; so the Targum of Jonathan,

``that smiteth with the third tongue;''

or false accusation: and all the people shall say Amen;
as disapproving of and condemning such a practice, even slander, and especially murder.