Bible Verses About Pardon: To those who confess their sins

And David said unto Nathan, I have sinned against Jehovah. And Nathan said unto David, Jehovah also hath put away thy sin; thou shalt not die.

I acknowledged my sin unto thee, And mine iniquity did I not hide: I said, I will confess my transgressions unto Jehovah; And thou forgavest the iniquity of my sin. [Selah

If we confess our sins, he is faithful and righteous to forgive us our sins, and to cleanse us from all unrighteousness.