Proverbs 28:13 NIV

1 John 1:8-10 NIV
If we claim to be without sin, we deceive ourselves and the truth is not in us. If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness. If we claim we have not sinned, we make him out to be a liar and his word is not in us.

Job 31:33 NIV
if I have concealed my sin as people do, by hiding my guilt in my heart