Romans 7:2:

For the woman which hath an husband is bound by the law to her husband so long as he liveth; but if the husband be dead, she is loosed from the law of her husband.

See also:

Unforgiveness Is Itself a Forgiven Sin, So How Could It Hinder My Healing?
Am I Sick Because God Has Turned Me Over to the Tormentors Because I Didn’t Forgive Someone?