"The Prophet (ﷺ) used to wear a ring of gold, then he discarded it, and put on a ring of silver on which was engraved (the words): 'Muhammad Rasul Allah.' He said: 'No one else should engrave his ring with an inscription like this ring of mine.' Then he put the stone toward the palm of his hand."
Reference: Sunan an-Nasa'i 5216 In-book : Book 48, Hadith 177 English translation : Vol. 6, Book 48, Hadith 5219
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