Psalm 73:13

Surely in vain I have kept my heart pure, and washed my hands in innocence.

Job 34:9

Indeed, he says, 'A man does not profit when he takes delight in God.'

Psalm 26:6

I will wash my hands in innocence, and I will walk about your altar, O Yahweh,

Job 21:15

Who [is] Shaddai that we should serve him, or what would we benefit when we plead with him?'

Job 35:3

If you ask what it profits you: 'How do I benefit {by refraining from my sin}?'

Job 9:27

Though {I say}, 'I will forget my complaint; I will change my expression, and I will rejoice,'

Job 9:31

then you plunge me into the [slime] pit, and my clothes abhor me.

Psalm 24:4

He who is innocent of hands and pure of heart, who does not lift up his soul to falseness, and does not swear deceitfully.

Psalm 51:10

Create a clean heart for me, O God, and renew a steadfast spirit {within me}.

Malachi 3:14

You have said, '[It is] useless to serve God! What [is the] gain if we keep his requirements, and if we walk as mourners {before} Yahweh of hosts?

Hebrews 10:19-22

Therefore, brothers, [since we] have confidence for the entrance into the sanctuary by the blood of Jesus,

James 4:8

Draw near to God, and he will draw near to you. Cleanse [your] hands, [you] sinners, and purify [your] hearts, [you] double-minded!

Treasury of Scripture Knowledge

Summary

Verily I have cleansed my heart in vain, and washed my hands in innocency.

Bible References

Verily

Job 9:27
Though {I say}, 'I will forget my complaint; I will change my expression, and I will rejoice,'
Job 21:15
Who [is] Shaddai that we should serve him, or what would we benefit when we plead with him?'
Job 34:9
Indeed, he says, 'A man does not profit when he takes delight in God.'
Job 35:3
If you ask what it profits you: 'How do I benefit {by refraining from my sin}?'
Malachi 3:14
You have said, '[It is] useless to serve God! What [is the] gain if we keep his requirements, and if we walk as mourners {before} Yahweh of hosts?

Washed

Psalm 24:4
He who is innocent of hands and pure of heart, who does not lift up his soul to falseness, and does not swear deceitfully.
Psalm 26:6
I will wash my hands in innocence, and I will walk about your altar, O Yahweh,
Psalm 51:10
Create a clean heart for me, O God, and renew a steadfast spirit {within me}.
Hebrews 10:19
Therefore, brothers, [since we] have confidence for the entrance into the sanctuary by the blood of Jesus,
James 4:8
Draw near to God, and he will draw near to you. Cleanse [your] hands, [you] sinners, and purify [your] hearts, [you] double-minded!

General references

Job 9:29
[If] I shall be [declared] guilty, why then should I labor in vain?
Job 34:8
And he goes on the road in company with instigators of mischief, and walks with men of wickedness.
Psalm 94:19
When my troubled thoughts were many {within me}, your consolations cheered my soul.
1 Corinthians 15:14
But if Christ has not been raised, then our preaching [is] in vain, and your faith [is] in vain.