Mukhtasar Muslim

It is narrated from Sayyiduna Abdullah bin Umar, may Allah be pleased with them both, that the Messenger of Allah, peace and blessings be upon him, had a ring of gold made. When he wore it, he would turn its stone towards the palm of his hand. Then one day, he sat on the pulpit and took off that ring and said: "I used to wear this ring and turn its stone inward," then he threw it away and said: "By Allah, I will never wear it again." Seeing this, the people also threw away their rings.