Romans 12:1:

I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.

See also:

Your Body Is God’s Property
Who You Are and What You Have
You Have Authority over Your Body
Objection: Sickness, While Unpleasant, Is Used by God to Build Character
Objection: God Uses Sickness to “Break” Us