Is it forbidden to sell on the sale of a Muslim during the period of option and after the period of option?

The questioner : Selling on the sale of Anas is forbidden, but is it so during the period of option, or even after the option has ended? And what does "during the period of option" mean? For example, an option by condition: I sold you this house, and you have the option for three days.

The Shaykh : Yes, so a man goes to the buyer and says, "Come, you bought so-and-so's house for one hundred thousand; I will give you a better house for fifty thousand." This is during the period of option. There is no doubt that this is forbidden. Why? Because the seller can annul the sale and buy with the new offer. Now, if the period of option has ended and selling on the sale of a Muslim occurs, is it forbidden or not? Yes, the well-known view in the school of jurisprudence is that it is not forbidden, because the buyer no longer has the option. Yes, and Ibn Rajab chose in his commentary on the Nawawi Forty that it is forbidden. He said that even though there is no option, perhaps he will come and find a defect in the goods or something similar, so that he can annul the sale.