The New John Gill Exposition of the Entire BibleDeuteronomy 27:24
Cursed [be] he that smiteth his neighbour secretly…
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
``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.