Proverbs 17:28

²⁶ Also to punish the just is not good, nor to strike princes for equity.

²⁷ He that hath knowledge spareth his words: and a man of understanding is of an excellent spirit.

Even a fool, when he holdeth his peace, is counted wise: and he that shutteth his lips is esteemed a man of understanding.

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

Compare

BSB: Even a fool is considered wise if he keeps silent, and discerning when he holds his tongue.
KJV: Even a fool, when he holdeth his peace, is counted wise: and he that shutteth his lips is esteemed a man of understanding.
WEB: Even a fool, when he keeps silent, is counted wise. When he shuts his lips, he is thought to be discerning.
ASV: Even a fool, when he holdeth his peace, is counted wise; When he shutteth his lips, he is [esteemed as] prudent.
DARBY: Even a fool when he holdeth his peace is reckoned wise, [and] he that shutteth his lips, intelligent.
BLB: Even a fool keeping silent is considered wise, one shutting his lips discerning.

ÅB: Også dåren aktes for klok når han tier, for vis når han holder sine lepper lukket.
OTB: Selv en dåre regnes som vis hvis han forblir taus, og forstandig hvis han holder sin tunge.
B1930: Også dåren aktes for klok når han tier, for vis når han holder sine leber lukket.

Job 13:5
O that ye would altogether hold your peace! and it should be your wisdom.
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Proverbs 15:2
The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness.
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Ecclesiastes 10:14
A fool also is full of words: a man cannot tell what shall be; and what shall be after him, who can tell him?
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Ecclesiastes 5:3
For a dream cometh through the multitude of business; and a fool’s voice is known by multitude of words.
Read in context
Ecclesiastes 10:3
Yea also, when he that is a fool walketh by the way, his wisdom faileth him, and he saith to every one that he is a fool.
Read in context