1 Timothy 1:19:

Holding faith, and a good conscience; which some having put away concerning faith have made shipwreck:

See also:

Temporary Cancelation of Sin’s Consequences Through Intercession
Sickness as Chastening and Judgment in the New Testament
Does Sin in My Life Stop Me from Getting Healed?
Is It Ever Right to NOT Minister Healing to Someone?
Objection: Paul Told Timothy to Drink Wine Instead of Believing God for Healing
Objection: Healing Cannot Be in the Atonement Because Healing Can Be Lost, but Salvation Cannot Be Lost
Objection: Preaching Divine Healing Shipwrecks the Faith of Many