1 John 1:9:

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

See also:

The Baseball Diamond of Healing
Forgiven People Can Be Healed
What If You Sin?
Temporary Cancelation of Sin’s Consequences Through Intercession
Healing and Correct Doctrine
The Insecure Preacher
Healing and Repentance
What 1 John 1:9 Really Means
Ruined Righteousness
Am I Sick Because God Is Mad at Me?
Does UNCONFESSED Sin in My Life Stop Me from Getting Healed?
Are Women Redeemed from Labor Pains?
Objection: Healing Cannot Be in the Atonement Because Healing Can Be Lost, but Salvation Cannot Be Lost
Objection: Faith Preachers Are Trinity-Denying Heretics Because They Teach That Jesus Died Spiritually
Objection: Divine Healing Teaching Is Gnosticism Because It Presumes Special Secret Knowledge Is Needed to Be Healed
Objection: James 5 in Context Speaks of a Believer Who Has Sinner and Spiritual Healing
Objection: Faith Teachers Say to HEAL the Sick, but James Said to PRAY for Them
Mistake: Unforgiveness
Notes on Acts 26:18
Notes on Romans 5:17
Notes on 1 Corinthians 6:9-11
Notes on 2 Corinthians 5:21
Notes on Ephesians 4:24
Notes on Philippians 4:19
Notes on Colossians 1:12-14
Notes on Colossians 2:15