It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that when the Prophet (peace and blessings be upon him) arrived in Madinah, he found that the people there used to transact dates on deferred payment for one, two, or three years. The Prophet (peace and blessings be upon him) said: "Whoever does a Salam sale in dates, he should specify its measure, specify its weight, and specify its term."