What is the ruling regarding a man divorcing his wife, believing he is sexually incapable, only to discover, four years later, that his wife was bewitched?

If a husband utters the words: "You are divorced," the divorce takes effect, even if the husband's inability was due to magic, because the explicit pronouncement of divorce takes effect even without intention.

The husband may remarry her if he divorced her once or twice. However, if he divorced her three times, she is not lawful for him until she marries another husband in a valid marriage with the intention of permanence, and he consummates the marriage with her, and then divorces her.