Sunan an-Nasa'i 5206

It was narrated from Abu Sa'eed Al-Khudri:"A man came from Al-Bahrain to the Prophet [SAW] and greeted him with Salam, but he did not return his greeting. He was wearing a gold ring on his hand, and was wearing a silken Jubbah. He took them off, then he greeted him with Salam, and he returned his greeting. Then he said: 'O Messenger of Allah, I came to you just now, and you turned away from me.' He said: 'You had a coal of fire on your hand.' He said: 'Then I have brought many coals.' He said: 'What you have brought with you is no better for us than the stones of Al-Harrah, but it is a temporary convenience of this world.' He said: 'What should I use for a ring?' He said: 'A ring of iron or silver or brass