Abu Rifa reported,

I came to the Messenger of Allah ﷺ while he was delivering a sermon, and I said, "Messenger of Allah, a stranger has come asking about his religion, not knowing what his religion is."The Messenger of Allah ﷺ turned to me, leaving his sermon, and came over until he reached me. A chair was brought, and I believe its legs were of iron. The Messenger of Allah ﷺ sat upon it and began teaching me from what Allah had taught him. Then he returned to his sermon and completed it.

أخبرنا يعقوب بن إبراهيم عن عبد الرحمن عن سليمان بن المغيرة عن حميد بن هلال قال

قال أبو رفاعة

انتهيت إلى رسول الله ﷺ وهو يخطب فقلت يا رسول الله رجل غريب جاء يسأل عن دينه لا يدري ما دينه فأقبل رسول الله ﷺ وترك خطبته حتى انتهى إلي فأتي بكرسي خلت قوائمه حديدا فقعد عليه رسول الله ﷺ فجعل يعلمني مما علمه الله ثم أتى خطبته فأتمها