Bible Verses About Christian prayers for forgiveness of sins

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

Wash me throughly from mine iniquity, and cleanse me from my sin. For I acknowledge my transgressions: and my sin is ever before me.KJV

Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.KJV

He that covereth his sins shall not prosper: but whoso confesseth and forsaketh them shall have mercy.KJV

And the publican, standing afar off, would not lift up so much as his eyes unto heaven, but smote upon his breast, saying, God be merciful to me a sinner.KJV