Psalm 18:24 repeats the same statement of reward for righteousness, reinforcing the theme within the same psalm.

Psalm 26:6 declares washing hands in innocence, a ritual expression of the same cleanness of hands that Psalm 18:20 mentions.

Psalm 24:4 describes the requirement of clean hands and pure heart to approach God, directly echoing the 'cleanness of my hands'.

Psalm 7:3 is a protest of innocence ('if there is wrong in my hands'), directly relating to the 'cleanness of my hands' in Psalm 18:20.

In Psalm 7:8, David asks to be judged according to his righteousness and integrity, identical theme to Psalm 18:20.

In Psalm 101:3, David resolves to avoid worthless things, reflecting the 'cleanness of my hands' commitment.

In Psalm 58:11, the general principle that the righteous are rewarded echoes David's personal claim in Psalm 18:20.

In Psalm 25:21, David prays for integrity to preserve him, similar to being rewarded for righteousness.

In 1 Samuel 24:17, Saul acknowledges David's righteousness, illustrating the righteousness for which God rewards him in Psalm 18:20.

In 1 Samuel 24:11-13, David's refusal to harm Saul demonstrates the cleanness of hands he claims in Psalm 18:20.

In Job 27:6, Job declares he holds fast his righteousness without reproach, directly paralleling David's 'cleanness of my hands'.

In 1 Kings 3:6, Solomon affirms David's righteousness and uprightness, aligning with the claim in Psalm 18:20.

2 Samuel 22:21 is a parallel version of the same psalm, repeating the statement about God rewarding David's righteousness.

In 1 Samuel 26:23, David explicitly states that the LORD rewards righteousness, the very principle behind Psalm 18:20.

In 1 Samuel 24:19, Saul's blessing that God will reward David for sparing him directly parallels the reward theme.

In Isaiah 38:3, Hezekiah reminds God of his faithful walk and whole heart, similar to David's righteousness claim.

James 4:8 calls for cleansing hands — directly echoing the 'cleanness of my hands' imagery from David's claim.

In 2 Chronicles 6:30, Solomon's prayer echoes the principle of God rewarding each according to their ways, paralleling Psalm 18:20.

In 1 Kings 8:39, Solomon prays that God will render to each according to their ways, a principle underlying the reward for righteousness.

Proverbs 11:18 contrasts deceptive wages with the sure reward for sowing righteousness, echoing the principle of divine reward for righteousness.

Matthew 6:4 promises reward from the Father for secret giving, aligning with the principle of divine reward for righteous actions.

1 Corinthians 3:8 teaches that each worker receives wages according to their labor, echoing the principle of reward based on one's deeds.

1 Thessalonians 2:10 shows Paul appealing to his blameless conduct before God — mirroring David's assertion of righteousness.