What is the ruling on saying, "And by divorce, I will not greet you nor speak to you," in a state of extreme anger, and does divorce occur thereby, knowing that the speaker did not intend divorce but rather it was uttered due to the intensity of his anger at a person who swore not to eat from his food?

Anger does not prevent the occurrence of divorce as long as the person is aware of what he is saying. If a person swears by divorce to cease greeting or speaking to a relative, and he is aware of what he is saying, then he breaks his oath and divorce occurs if he greets him or speaks to him, and an expiation for breaking an oath becomes obligatory upon him. The majority of scholars hold that swearing by divorce results in divorce upon breaking the oath, while Sheikh al-Islam Ibn Taymiyyah is of the opinion that its ruling is like swearing by Allah if divorce was not intended, and only an expiation for breaking an oath is required.

Boycotting a Muslim brother for more than three nights is impermissible, just as discarding edible food into the trash is impermissible due to the waste of resources involved. Swearing by divorce is not legislated; what is legislated is swearing by Allah the Almighty.