Sayyiduna Abu al-Wadi’ (may Allah be pleased with him) narrates that we participated in a military expedition, and we camped at a certain place. (During this time) one of our companions sold his horse in exchange for a slave, and then he spent the remaining part of the day and night there until morning. When it was time to depart, the man got up to saddle his horse and regretted (selling the horse). Since the other man had bought the horse, he took hold of it. So both of them went to Sayyiduna Abu Barzah (may Allah be pleased with him) and told him this story. He said:“If I judge between you according to the decision of the Messenger of Allah (peace and blessings be upon him), will you accept it?”The Messenger of Allah (peace and blessings be upon him) said:“The buyer and the seller have the right (to cancel the sale) as long as they have not separated from each other.”