Romans 6:14:

For sin shall not have dominion over you: for ye are not under the law, but under grace.

See also:

Who You Are and What You Have
Dealing with Fear
Paper Roadblocks to Healing
Don’t Believe These Alcoholics Anonymous Lies
Can I Get Healed of Alcoholism, Drug Abuse, Pornography and Homosexuality?
Objection: Jesus Redeemed Us from Disease, But the Fulfillment of That Won’t Come Until We Get Glorified Bodies
Objection: If We Are Subject to Death, We Are Subject to Sickness
Objection: Because We Are Still Capable of Sinning, We Must Be Subject to Sickness, an Effect of Sin
Objection: Just as We Will Never Have Victory over Sin in This Life, We Will Never Have Victory over Sickness
Objection: Teaching Grace Gives People a License to Sin