Galatians 6:1:

Brethren, if a man be overtaken in a fault, ye which are spiritual, restore such an one in the spirit of meekness; considering thyself, lest thou also be tempted.

See also:

If You Blow It
Who or What Causes Sickness?
Why Does God Keep Using a Certain Healing Minister So Mightily When His Personal Life Is So Messed Up?
Objection: Healing Cannot Be in the Atonement Because Healing Can Be Lost, but Salvation Cannot Be Lost