Proverbs 12:18 in the King James Version
There is that speaketh like the piercings of a sword: but the tongue of the wise is health.
Context
17 He who is truthful testifies honestly, but a false witness lies.
18 There is one who speaks rashly like the piercing of a sword, but the tongue of the wise heals.
19 Truth’s lips will be established forever, but a lying tongue is only momentary.