Does a divorce occur for someone who swore an oath of triple divorce not to sell a car for less than a certain price, then his agent sold it for less than that, and is expiation obligatory upon him, and is he required to demand the buyer pay the difference?

The majority view is that divorce occurs upon breaking an oath sworn by divorce, and that uttering the triple divorce pronouncement counts as three divorces. However, Sheikh al-Islam Ibn Taymiyyah holds that an oath sworn by divorce, when not intended as a suspension of divorce, falls under the ruling of an oath sworn by Allah, necessitating an expiation for an oath and not resulting in divorce. He also believes that uttering the triple divorce pronouncement counts as a single divorce.

Regarding the questioner's oath concerning the car, if his intention was not to sell the car himself, then he has not broken his oath if his brother sells it. However, if his intention was that the car should not be sold for anything less than that price, even if through his brother, then he has broken his oath. This is similar to someone who swears not to buy or sell an item from a specific person, and then orders someone else to do so; he would have broken his oath unless he intended to perform the action himself directly.