Psalm 73:13

Truly have I purified my heart in vain, and washed my hands in innocency:

Job 34:9

For he hath said, It profiteth not a man if he delight himself in God.

Psalm 26:6

I will wash my hands in innocency, and will encompass thine altar, O Jehovah,

Job 21:15

What is the Almighty that we should serve him? and what are we profited if we pray unto him?

Job 35:3

For thou hast asked of what profit it is unto thee: what do I gain more than if I had sinned?

Job 9:27

If I say, I will forget my complaint, I will leave off my sad countenance, and brighten up,

Job 9:31

Then wouldest thou plunge me in the ditch, and mine own clothes would abhor me.

Psalm 24:4

He that hath blameless hands and a pure heart; who lifteth not up his soul unto vanity, nor sweareth deceitfully:

Psalm 51:10

Create in me a clean heart, O God, and renew a steadfast spirit within me.

Malachi 3:14

Ye say, It is vain to serve God; and what profit is it that we keep his charge, and that we walk mournfully before Jehovah of hosts?

Hebrews 10:19-22

Having therefore, brethren, boldness for entering into the holy of holies by the blood of Jesus,

James 4:8

Draw near to God, and he will draw near to you. Cleanse your hands, sinners, and purify your hearts, ye 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
If I say, I will forget my complaint, I will leave off my sad countenance, and brighten up,
Job 21:15
What is the Almighty that we should serve him? and what are we profited if we pray unto him?
Job 34:9
For he hath said, It profiteth not a man if he delight himself in God.
Job 35:3
For thou hast asked of what profit it is unto thee: what do I gain more than if I had sinned?
Malachi 3:14
Ye say, It is vain to serve God; and what profit is it that we keep his charge, and that we walk mournfully before Jehovah of hosts?

Washed

Psalm 24:4
He that hath blameless hands and a pure heart; who lifteth not up his soul unto vanity, nor sweareth deceitfully:
Psalm 26:6
I will wash my hands in innocency, and will encompass thine altar, O Jehovah,
Psalm 51:10
Create in me a clean heart, O God, and renew a steadfast spirit within me.
Hebrews 10:19
Having therefore, brethren, boldness for entering into the holy of holies by the blood of Jesus,
James 4:8
Draw near to God, and he will draw near to you. Cleanse your hands, sinners, and purify your hearts, ye double-minded.

General references

Job 9:29
Be it that I am wicked, why then do I labour in vain?
Job 34:8
And goeth in company with workers of iniquity, and walketh with wicked men.
Psalm 94:19
In the multitude of my anxious thoughts within me thy comforts have delighted my soul.
1 Corinthians 15:14
but if Christ is not raised, then, indeed, vain also is our preaching, and vain also your faith.