Psalms 18:20

¹⁸ They confronted me in my day of calamity, but the LORD was my support.

¹⁹ He brought me out into the open; He rescued me because He delighted in me.

The LORD has rewarded me according to my righteousness; He has repaid me according to the cleanness of my hands.

²¹ For I have kept the ways of the LORD and have not wickedly departed from my God.

²² For all His ordinances are before me; I have not disregarded His statutes.

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

Compare

BSB: The LORD has rewarded me according to my righteousness; He has repaid me according to the cleanness of my hands.
KJV: The LORD rewarded me according to my righteousness; according to the cleanness of my hands hath he recompensed me.
WEB: The LORD has rewarded me according to my righteousness. According to the cleanness of my hands, he has recompensed me.
ASV: Jehovah hath rewarded me according to my righteousness; According to the cleanness of my hands hath he recompensed me.
DARBY: Jehovah hath rewarded me according to my righteousness; according to the cleanness of my hands hath he recompensed me.
BLB: YHWH rewarded me according to my righteousness; according to the cleanness of my hands, He returned [it] to me.

ÅB: Herren gjengjeldte meg etter min rettferdighet;
han betalte meg etter mine henders renhet.
OTB: Herren har belønnet meg i samsvar med min rettferdighet;
Etter mine henders renhet har han gjengjeldt meg.
B1930: Herren gjengjeldte mig efter min rettferdighet, han betalte mig efter mine henders renhet.

Psalms 24:4
He who has clean hands and a pure heart, who does not lift up his soul to an idol or swear deceitfully.
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Matthew 6:4
so that your giving may be in secret. And your Father, who sees what is done in secret, will reward you.
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1 Corinthians 3:8
He who plants and he who waters are one in purpose, and each will be rewarded according to his own labor.
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Psalms 58:11
Then men will say, “There is surely a reward for the righteous! There is surely a God who judges the earth!”
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Job 22:30
He will deliver even one who is not innocent, rescuing him through the cleanness of your hands.”
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Proverbs 11:18
The wicked man earns an empty wage, but he who sows righteousness reaps a true reward.
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Isaiah 62:11
Behold, the LORD has proclaimed to the ends of the earth, “Say to Daughter Zion: See, your Savior comes! Look, His reward is with Him, and His recompense goes before Him.”
Read in context
Hebrews 7:26
Such a high priest truly befits us—One who is holy, innocent, undefiled, set apart from sinners, and exalted above the heavens.
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