1 Timothy 6:20-21:

O Timothy! Guard what was committed to your trust, avoiding the profane and idle babblings and contradictions of what is falsely called knowledge—
by professing it some have strayed concerning the faith. Grace be with you. Amen.

See also:

Where Did Demons Come From?
Objection: Healing Cannot Be in the Atonement Because Healing Can Be Lost, but Salvation Cannot Be Lost
Objection: Medical Studies Have Proven That Faith Healing Works by the Placebo Effect
Objection: Faith Must Be IN GOD (Mark 11:22), So It Is Not Something You Can Use Yourself to Change Things