Volume 7, Book 72, Number 762:
Narrated Ibn ‘Umar:
Allah’s Apostle had a silver ring made for himself and it was worn by him on his hand. Afterwards
it was worn by Abu Bakr, and then by ‘Umar, and then by ‘Uthman till it fell in the Aris well. (On that
ring) was engraved: ‘Muhammad, the Apostle of Allah.”