It is narrated from Sayyiduna Abu Rifa’ah ‘Adawi (may Allah be pleased with him) that he said: I came to the service of the Prophet (peace and blessings of Allah be upon him) while he was delivering a sermon. I said: O Messenger of Allah! A stranger has come to you who asks about his religion. He does not know what his religion is. So the Prophet (peace and blessings of Allah be upon him) left the sermon and came to me. Then a chair was brought, and I think its legs were made of iron. (Humaid says: In my opinion, it was made of black wood, which he thought was iron.) So the Prophet (peace and blessings of Allah be upon him) sat on it. Then he began to teach me the commands that Allah had taught him. Then afterwards, the Prophet (peace and blessings of Allah be upon him) completed his sermon.