Or maybe this one:

Psalm 19

1 The heavens are telling of the glory of God;
And their expanse is declaring the work of His hands.

2 Day to day pours forth speech,
And night to night reveals knowledge.

3 There is no speech, nor are there words;
Their voice is not heard.

4 Their line has gone out through all the earth,
And their utterances to the end of the world.
In them He has placed a tent for the sun,

5 Which is as a bridegroom coming out of his chamber;
It rejoices as a strong man to run his course.

6 Its rising is from one end of the heavens,
And its circuit to the other end of them;
And there is nothing hidden from its heat.

[...and my favorite part...7-9]
7 The law of the LORD is perfect, restoring the soul;
The testimony of the LORD is sure, making wise the simple.

8 The precepts of the LORD are right, rejoicing the heart;
The commandment of the LORD is pure, enlightening the eyes.

9 The fear of the LORD is clean, enduring forever;
The judgments of the LORD are true; they are righteous altogether.

10 They are more desirable than gold, yes, than much fine gold;
Sweeter also than honey and the drippings of the honeycomb.

11 Moreover, by them Your servant is warned;
In keeping them there is great reward.

12 Who can discern his errors? Acquit me of hidden faults.

13 Also keep back Your servant from presumptuous sins;
Let them not rule over me; Then I will be blameless,
And I shall be acquitted of great transgression.

14 Let the words of my mouth and the meditation of my heart
Be acceptable in Your sight,
O LORD, my rock and my Redeemer.



This psalm makes me feel clean, especially verses 7-9.