It is narrated from Hazrat Abu Saeed (may Allah be pleased with him) that once fresh dates of the variety "Riyan" were presented to the Prophet (peace and blessings be upon him). Dry "Ba'l" dates used to come to the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) asked, "Where did you get these from?" He replied, "We gave two sa’ of our dates and took one sa’ of these superior dates." The Prophet (peace and blessings be upon him) said, "This method is not correct. The correct way is that you sell your dates, and then buy the dates you need."