1 Corinthians 4:4

(for though I am not conscious to my self of any unfaithfulness, yet am I not hereby absolved:) but he that is my supreme judge, is the Lord.

James 3:2

for we are all liable to frequent mistakes. he that does not give too great a loose to his tongue, is an accomplish'd person and fit to moderate the whole church.

1 John 1:8-10

If we say that we are without sin, we deceive ourselves, and have no regard to truth.

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 not conscious to my self of any unfaithfulness, yet am I not hereby absolved:) but he that is my supreme judge, is the Lord.
James 3:2
for we are all liable to frequent mistakes. he that does not give too great a loose to his tongue, is an accomplish'd person and fit to moderate the whole church.
1 John 1:8
If we say that we are without sin, we deceive ourselves, and have no regard to truth.