Abu Rifa'ah al-Adawi (may Allah be pleased with him) says that I went to the Prophet (peace and blessings be upon him) while he (peace and blessings be upon him) was delivering the sermon. I said: O Messenger of Allah! A stranger has come; he is asking about the religion, and he does not know what the religion is. So he (peace and blessings be upon him) turned towards me and left his sermon. A chair was brought; I think its legs were of iron. He (peace and blessings be upon him) began teaching me what Allah had taught him (peace and blessings be upon him). Then he (peace and blessings be upon him) completed the sermon.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5817