Sunan An-Nasa'i

It was narrated from Ibn 'Umar that:The Messenger of Allah [SAW] had a ring made of gold and he used to wear it with the stone (Fass) against his palm, and the people did likewise. Then he sat on the Minbar and said: ""I used to wear this ring and put its stone (Fass) on the inside."" Then he threw it away and said: ""By Allah, I will never wear it again."" And the people threw their rings away