Bukhari :: Book 7 :: Volume 72 :: Hadith 766
Narrated Anas bin Malik :
Allah's Apostle took a silver ring and had 'Muhammad, the Apostle' of Allah' engraved on it. The Prophet then said (to us), 'I have a silver ring with 'Muhammad, the Apostle of Allah engraved on it, so none of you should have the same engraving on his ring."
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