1 Corinthians 4:4

For I am not conscious to myself of any thing, yet am I not hereby justified; but he that judgeth me is the Lord.

James 3:2

For in many things we offend all. If any one offend not in word, the same is a perfect man, able also to bridle the whole body.

1 John 1:8-10

If we say, we have no sin, we deceive ourselves, and the truth is not in us.

Treasury of Scripture Knowledge

Summary

Who can say, I have made my heart clean, I am pure from my sin?

Bible References

General references

1 Corinthians 4:4
For I am not conscious to myself of any thing, yet am I not hereby justified; but he that judgeth me is the Lord.
James 3:2
For in many things we offend all. If any one offend not in word, the same is a perfect man, able also to bridle the whole body.
1 John 1:8
If we say, we have no sin, we deceive ourselves, and the truth is not in us.