It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that when the delegation of Banu Abdul Qais came to the service of the Prophet (peace be upon him), they said: "We belong to the tribe of Rabi'ah. Between us and you is the tribe of the disbelievers of Mudar, and we can only come to you during the sacred months. So tell us something by acting upon which we may enter Paradise, and we may also tell those who are behind us." The Prophet (peace be upon him) commanded them to do four things and forbade them from four things. The Prophet (peace be upon him) commanded them: "Worship Allah alone, do not associate anything with Him, fast in Ramadan, and send one-fifth of the spoils of war to the treasury (Bayt al-Mal)." And the Prophet (peace be upon him) forbade them from using vessels called Duba', Hantam, Naqir, and Muzaffat (which were used for drinking alcohol and whose explanation has already been mentioned several times before). They asked: "O Messenger of Allah (peace be upon him)! Then in which vessels should we drink water?" The Prophet (peace be upon him) said: "In leather waterskins whose mouths can be tied."