(80) باب مَوْضِعِ الْفَصِّ
It was narrated that Ibn 'Umar said:
"The Prophet [SAW] 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 reference: Book 48, Hadith 249
English translation: Vol. 6, Book 48, Hadith 5290