It is narrated from Sayyiduna Abu Sa'id and Sayyiduna Abu Huraira (may Allah be pleased with them) that the Messenger of Allah (peace and blessings be upon him) appointed a man as a collector at Khaybar. He brought excellent dates. The Prophet (peace and blessings be upon him) asked: "Are all the dates of Khaybar like this?" He replied: "No, O Messenger of Allah! We buy one sa' of these dates for two sa's (of ordinary dates), or two sa's for three sa's." The Prophet (peace and blessings be upon him) said: "Do not do so. First sell the inferior dates for money, then buy the superior dates with that money."