Abu Dahqanah says that once I was sitting in the company of Sayyiduna Ibn Umar (may Allah be pleased with them), and he said that once a guest came to the Prophet Muhammad (peace and blessings be upon him). The Prophet (peace and blessings be upon him) ordered Sayyiduna Bilal (may Allah be pleased with him) to bring food. Sayyiduna Bilal (may Allah be pleased with him) went and gave two sa’ of dates that he had, which were of a slightly lower quality, and in exchange brought one sa’ of fine dates. The Prophet (peace and blessings be upon him) was surprised to see the fine dates and asked,“Where did these dates come from?”Sayyiduna Bilal (may Allah be pleased with him) informed him that he had given two sa’ and taken one sa’ of dates. The Prophet (peace and blessings be upon him) said:“Return the dates that were ours.”