"The Prophet (ﷺ) wore a ring of gold, then he discarded it and wore a ring of silver on which were engraved (the words) 'Muhammad Rasul Allah.' Then he said: 'No one should copy this inscription of mine.' And he wore the stone (Fass) toward his palm."
Reference: Sunan an-Nasa'i 5288 In-book : Book 48, Hadith 249 English translation : Vol. 6, Book 48, Hadith 5290
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