"The Messenger of Allah delayed 'Isha' prayer one night, until half the night had passed, then he came out and led us in prayer. And it is as if I can see the whiteness of his silver ring on his hand."
Sunan an-Nasa'i Book 48, Hadith 163
← Previous Hadith "The Messenger of Allah wanted to write to the Romans, but they (the Companions) said: 'They do not read any letter unless it has a seal.' So he took a ring of silver, and it is as if I can see its whiteness on his hand, and on it were engraved (the words): "Muhammad Rasul Allah (Muhammad the Messenger of Allah)."

Sunan an-Nasa'i Book 48, Hadith 162 Next Hadith → "And Abu Salamah informed me" - That the Prophet used to wear his ring on his right hand.

Sunan an-Nasa'i Book 48, Hadith 164