Bible Verses About Pardon: To those who confess their sins

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

I acknowledged my sin unto thee, and mine iniquity have I not hid. I said, I will confess my transgressions unto the LORD; and thou forgavest the iniquity of my sin. Selah.

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