Romans 10:9-10:

That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.

Notes on Romans 10:9-10:

Because salvation in the New Testament incorporates forgiveness, healing, and deliverance from evil in this life (see Saved!), it should follow that with your heart you believe and with your mouth confession is made unto healing.  In other words, you must say that you are healed before your body will be healed.  You can’t wait until after your body is healed to say so any more than you can wait to feel saved from your sins before you confess that Jesus has saved you from your sins.  Confession is made unto salvation!  This point is elaborated upon in the discussions below.

See also:

Notes on Joshua 1:7-8
Notes on Mark 16:15-18
Notes on Luke 17:5-6
Saved!
How to Be Saved from Your Sins
Say What
Don’t Drag People to the Altar
Who You Are and What You Have
Prayers God Won’t Answer
How to Build Your Faith
The Confession UNTO Faith and the Confession OF Faith
You’re Dead!
What Romans 8:11 Really Means
What Romans 8:9 Really Means
Does Faith Come from Your Spirit, Your Mind or Somewhere Else?
Objection: Faith Is Simply Trust in God, Not a Force That You Use to Change Things Yourself
Objection: David Was Honest Enough to Sing to God About His Sicknesses; We Should Pray “Honest” Prayers Like His Rather Than Saying We’re Healed When Our Bodies Say Otherwise
Objection: It Is Presumption to Think That Life and Death Are in Your Power
Objection: Faith Preachers Are Trinity-Denying Heretics Because They Teach That Jesus Died Spiritually
Objection: Occult Practitioners Attempt to Confess Things into Existence and Speak to Material Things to Make Them Change
Objection: Only Some People Have the “Gift of Faith” to Believe for Healing
Condition: Venereal Diseases