English translation
2109. Narrated Ibn 'Umar رَضِيَ اللَّهُ عَنْهُمَا: Allāh's Messenger ﷺ said, "The seller and the buyer have the option of cancelling or confirming the deal unless they separate, or one of them says to the other, 'Choose (i.e., decide to cancel or confirm the bargain now).' Perhaps he said, 'Or if it is an optional sale.'" =they separate, they no longer have such an option. If, while they are still together, one of them gives the other the option of cancelling or confirming the bargain and they agree upon a decision, the bargain is regarded as final even though they have not separated. On the other hand, if the buyer and the seller agree upon having the option of cancelling or confirming the bargain after they separate, the bargain is not regarded as final unless the period of the option has elapsed. (Al-Qaṣālānī, Vol. 4).