Abdullah bin Buraidah narrates from his father that a man came to the service of the Prophet Muhammad (peace be upon him). He was wearing a ring made of iron. The Prophet (peace be upon him) said: What is the reason that I see on you the adornment of the people of Hell? The man took it off, then he came again to your service wearing a ring made of brass. The Prophet (peace be upon him) said: What is the reason that I smell the odor of idols from you? He said: O Messenger of Allah (peace be upon him), from what material should I wear a ring? The Prophet (peace be upon him) said: Of silver, and do not make it a full mithqal (i.e., let it be of less weight than that).