Psalms 18:20

¹⁸ They prevented me in the day of my calamity: but the LORD was my stay.

¹⁹ He brought me forth also into a large place; he delivered me, because he delighted in me.

The LORD rewarded me according to my righteousness; according to the cleanness of my hands hath he recompensed me.

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

²² For all his judgments were before me, and I did not put away his statutes from me.

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 that hath clean hands, and a pure heart; who hath not lifted up his soul unto vanity, nor sworn deceitfully.
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Matthew 6:4
That thine alms may be in secret: and thy Father which seeth in secret himself shall reward thee openly.
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1 Corinthians 3:8
Now he that planteth and he that watereth are one: and every man shall receive his own reward according to his own labour.
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Psalms 58:11
So that a man shall say, Verily there is a reward for the righteous: verily he is a God that judgeth in the earth.
Read in context
Job 22:30
He shall deliver the island of the innocent: and it is delivered by the pureness of thine hands.
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Proverbs 11:18
The wicked worketh a deceitful work: but to him that soweth righteousness shall be a sure reward.
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Isaiah 62:11
Behold, the LORD hath proclaimed unto the end of the world, Say ye to the daughter of Zion, Behold, thy salvation cometh; behold, his reward is with him, and his work before him.
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Hebrews 7:26
For such an high priest became us, who is holy, harmless, undefiled, separate from sinners, and made higher than the heavens;
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