Proverbs 29:9

⁷ The righteous considereth the cause of the poor: but the wicked regardeth not to know it.

⁸ Scornful men bring a city into a snare: but wise men turn away wrath.

If a wise man contendeth with a foolish man, whether he rage or laugh, there is no rest.

¹⁰ The bloodthirsty hate the upright: but the just seek his soul.

¹¹ A fool uttereth all his mind: but a wise man keepeth it in till afterwards.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: If a wise man goes to court with a fool, there will be raving and laughing with no resolution.
KJV: If a wise man contendeth with a foolish man, whether he rage or laugh, there is no rest.
WEB: If a wise man goes to court with a foolish man, the fool rages or scoffs, and there is no peace.
ASV: If a wise man hath a controversy with a foolish man, Whether he be angry or laugh, there will be no rest.
DARBY: If a wise man contendeth with a fool, whether he rage or laugh, [he] hath no rest.
BLB: A wise man enters into judgment with a foolish man, and he trembles and laughs, and [there is] no rest.

ÅB: Når en vismann går i rette med en dåre, så blir dåren vred og ler, og der blir ingen ro.
OTB: Når en vis person engasjerer seg i en tvist med en dåre, raser eller håner dåren, og det er ingen fred.
B1930: Når en vismann går i rette med en dåre, så blir dåren vred og ler, og der blir ingen ro.

Proverbs 26:4
Answer not a fool according to his folly, lest thou also be like unto him.
Read in context
Ecclesiastes 10:13
The beginning of the words of his mouth is foolishness: and the end of his talk is mischievous madness.
Read in context
Matthew 7:6
Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you.
Read in context
Matthew 11:17–19
And saying, We have piped unto you, and ye have not danced; we have mourned unto you, and ye have not lamented.
Read in context