1 Corinthians 4:4

for though I am conscious to myself of nothing wrong, yet not by this am I cleared of blame; but he that judgeth me is the Lord.

James 3:2

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

1 John 1:8-10

If we say that 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 though I am conscious to myself of nothing wrong, yet not by this am I cleared of blame; but he that judgeth me is the Lord.
James 3:2
For in many things we all offend. If any one offend not in speech, the same is a perfect man, able to bridle the whole body also.
1 John 1:8
If we say that we have no sin, we deceive ourselves, and the truth is not in us.