الشمائل المحمدية

Ibn 'Umar said: "The Prophet (Allah bless him and give him peace) chose a signet ring of silver, and put its stone in the part close to the palm of his hand. On it he engraved: “Muhammad is the Messenger of Allah,” and he forbade anyone to engrave on it. It is the one that fell from Mu'aiqib into the well of Aris.”