דִּבְרֵ֣י רְשָׁעִ֣ים אֱרָב־דָּ֑ם וּפִ֥י יְ֝שָׁרִ֗ים יַצִּילֵֽם׃
The words of the wicked are to lie in wait for blood; But the mouth of the upright shall deliver them. .
Rashi on Proverbs
The words of the wicked are to lurk for blood They take counsel to murder directly or through false testimony.
Rashi on Proverbs
but the mouth of the upright when they hear [the wicked’s] counsel, will save the victims, for they will reveal [the wicked’s] plot, or if they are witnesses, [the upright] will prove them to be collusive.