Proverbs 20:30

²⁸ Loving devotion and faithfulness preserve a king; by these he maintains his throne.

²⁹ The glory of young men is their strength, and gray hair is the splendor of the old.

Lashes and wounds scour evil, and beatings cleanse the inmost parts.

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

Compare

BSB: Lashes and wounds scour evil, and beatings cleanse the inmost parts.
KJV: The blueness of a wound cleanseth away evil: so do stripes the inward parts of the belly.
WEB: Wounding blows cleanse away evil, and beatings purge the innermost parts.
ASV: Stripes that wound cleanse away evil; And strokes [reach] the innermost parts.
DARBY: Wounding stripes purge away evil, and strokes [purge] the inner parts of the belly.
BLB: Stripes that wound scour evil, and beatings, the chambers of the belly.

ÅB: Et tuktemiddel for de onde er buler og sår og slag, som trenger inn i hjertets indre.
OTB: Slag og sår renser bort det onde, og pryl renser det innerste vesen.
B1930: Et tuktemiddel for de onde er buler og sår og slag, som trenger inn i hjertets indre.

Hebrews 12:10
Our fathers disciplined us for a short time as they thought best, but God disciplines us for our good, so that we may share in His holiness.
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Proverbs 22:15
Foolishness is bound up in the heart of a child, but the rod of discipline drives it far from him.
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Proverbs 19:25
Strike a mocker, and the simple will beware; rebuke the discerning man, and he will gain knowledge.
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Isaiah 53:5
But He was pierced for our transgressions, He was crushed for our iniquities; the punishment that brought us peace was upon Him, and by His stripes we are healed.
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Isaiah 27:9
Therefore Jacob’s guilt will be atoned for, and the full fruit of the removal of his sin will be this: When he makes all the altar stones like crushed bits of chalk, no Asherah poles or incense altars will remain standing.
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