In Psalm 24:4, clean hands and pure heart are blessed, contrasting with the psalmist's feeling that his purity is unrewarded.

In Psalm 26:6, washing hands in innocence is a confident declaration, contrasting with the psalmist's lament that it is in vain.

Psalm 58:11 declares there is a reward for the righteous — directly contradicting the psalmist's feeling that his purity is in vain.

In Psalm 51:10, David prays for a pure heart from God, while the psalmist laments his own efforts at purity seem futile.

Hebrews 10:19-22 offers the NT solution: through Christ's blood, believers have confident access to God, answering the psalmist's despair that his purity was in vain.

In Job 9:31, washing is futile because God plunges him into filth, directly paralleling the psalmist's washed hands feeling vain.

In Job 21:15, the wicked ask what gain there is in serving God, exactly the doubt the psalmist expresses about keeping pure.

In Job 34:9, Elihu quotes the claim that pleasing God profits nothing, mirroring the psalmist's lament that purity is in vain.

In Job 35:3, the question 'What gain by not sinning?' directly matches the psalmist's doubt about the value of innocence.

In Malachi 3:14, the people say serving God is futile with no gain, identical to the psalmist's complaint about keeping pure.

Job 9:29 echoes the same despair: 'why do I labor in vain?' — Job feels his righteousness is futile, just as the psalmist laments.

Job 17:9 asserts that the righteous with clean hands grow stronger — directly opposing the psalmist's claim that his clean hands are in vain.

Ecclesiastes 8:14 describes the same vanity: righteous suffering as if wicked — exactly the problem the psalmist laments.

In 1 Corinthians 15:58, Paul reverses the psalmist's lament: because of resurrection, labor in the Lord is not in vain — a direct contrast.

In 1 Corinthians 15:32, Paul argues that without resurrection, suffering for Christ is as pointless as the psalmist's righteous living — both 'in vain'.

James 4:8 uses the same 'cleanse your hands' imagery, but calls sinners to repentance, contrasting the psalmist's complaint of futile purity.

In 1 Corinthians 15:14, Paul echoes the same 'vain' futility — if Christ is not risen, faith is as pointless as the psalmist's cleansed heart.

In 1 Thessalonians 2:1, Paul affirms his ministry was not in vain — contrasting the psalmist's feeling that his cleansing was in vain.

Deuteronomy 21:6 describes the ritual hand-washing to declare innocence — the same symbolic act the psalmist uses metaphorically.

Genesis 20:5 has Abraham claiming 'innocence of my hands' — the same phrase the psalmist uses, but Abraham's claim is about a specific act.