The ruling when the seller swears to confirm that he made a mistake in the price

Question : And if he swears, the buyer has the choice between canceling the contract, because he was not satisfied with it for more than what he offered, and accepting it while being given the amount of the mistake and having it deducted from the profit. This is because the seller only sold it at this price under the impression that it was the capital, so he suffers harm from the reduction. If the buyer takes it at that price, the seller has no option to cancel, because the harm has been removed from him by the buyer’s commitment to the amount of the mistake. And if the buyer chooses to cancel and the seller says, “I waive the excess for you,” the cancellation is waived, because he has offered it to him at the price on which the contract was concluded and they agreed upon it.

Answer : Correct. That is, if the buyer says this after the seller states that he made a mistake. If the seller says to the buyer, “Take it at what we agreed upon,” and the buyer says, “I want to cancel,” then he cannot be allowed to cancel, because the harm has increased. But if the judge sees that he should allow the buyer to cancel as a disciplinary measure for the seller, since he was accused, there is no harm. And Allah knows best.