Sayyiduna Ibn Umar (may Allah be pleased with them) narrated that the Messenger of Allah (peace and blessings be upon him) said: When two people engage in a sale, both of them have the option (to cancel the sale) as long as they do not separate. This is in the case when both remain in the same place. However, if one says to the other to choose (i.e., decide), and the sale is made on this condition, and both make a final decision regarding the sale, then the sale is concluded at that very moment. Similarly, if both parties separate after the sale and neither of them rejects the sale, then the sale also becomes binding.