Hebrews 13:4:

Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.

See also:

Unforgiveness Is Itself a Forgiven Sin, So How Could It Hinder My Healing?
Objection: Faith People Sometimes Say that They’re Healed but Just Have Symptoms.  What Good Is It to Be Healed If You Have Symptoms?