Volume 7, Book 72, Number 761:
Narrated Anas bin Malik:
Allah’s Apostle wanted to write a letter to a group of people or some non-Arabs. It was said to him,
“They do not accept any letter unless it is stamped.” So the Prophet had a silver ring made for himself,
and on it was engraved: ‘Muhammad, the Apostle of Allah’. .. as if I am now looking at the glitter of
the ring on the finger (or in the palm) of the Prophet .
Volume 7 – 1310 / 1700
SAHIH BUKHARI VOLUME 7 > BOOK 72: DRESS