It was narrated that Humaid bin Hilal said:"Abu Rifa'ah said: 'I came to the Messenger of Allah [SAW] while he was delivering a Khutbah, and said: "O Messenger of Allah, a stranger has come to ask about his religion, for he does not know what his religion is." The Messenger of Allah [SAW] stopped delivering his Khutbah and turned to me. A chair was brought, and I think its legs were of iron. The Messenger of Allah [SAW] sat down on it and started to teach me what Allah has taught him, then he went and completed his Khutbah

English translation · Sunan an-Nasa'i