Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that when Khaybar was conquered, the Jews requested the Messenger of Allah (peace and blessings of Allah be upon him) to allow them to stay there on the condition that they would work in exchange for half of the produce, that is, dates and grain. The Messenger of Allah (peace and blessings of Allah be upon him) said: We will allow you to stay here on this condition as long as we wish. Thus, during the time of the Messenger of Allah (peace and blessings of Allah be upon him), and for some time during the caliphates of Sayyiduna Abu Bakr (may Allah be pleased with him) and Sayyiduna Umar (may Allah be pleased with him), they continued to work there on this condition. The dates obtained from half the produce of Khaybar would be divided into several portions, and the Messenger of Allah (peace and blessings of Allah be upon him) would take the khums (one-fifth).