Al-Adab Al-Mufrad, Book 47, Hadith 1164 (In-Book) ⓘ

Abu Rifa'a al-'Adawi said, "I came to the Messenger of Allah, may Allah bless him and grant him peace, while he was speaking [i.e. on Jumu'a]. I said, 'Messenger, a stranger man has come to ask about his deen. He does not know what his deen is.' He turned to me and stopped speaking. He was brought a chair which I think had iron legs. (Hamid [one of the transmitters] said, 'I think that it was black wood like iron).'] He sat down on it and began to teach me what Allah had taught him. Then he finished his speech."

حَدَّثَنَا عَبْدُ اللهِ بْنُ يَزِيدَ، قَالَ‏:‏ حَدَّثَنَا سُلَيْمَانُ بْنُ الْمُغِيرَةِ، عَنْ حُمَيْدِ بْنِ هِلاَلٍ، عَنْ أَبِي رِفَاعَةَ الْعَدَوِيِّ قَالَ‏:‏ انْتَهَيْتُ إِلَى النَّبِيِّ صلى الله عليه وسلم وَهُوَ يَخْطُبُ، فَقُلْتُ‏:‏ يَا رَسُولَ اللهِ، رَجُلٌ غَرِيبٌ جَاءَ يَسْأَلُ عَنْ دِينِهِ، لاَ يَدْرِي مَا دِينُهُ، فَأَقْبَلَ إِلَيَّ وَتَرَكَ خُطْبَتَهُ، فَأَتَى بِكُرْسِيٍّ خِلْتُ قَوَائِمَهُ حَدِيدًا، قَالَ حُمَيْدٌ‏:‏ أُرَاهُ خَشَبًا أَسْوَدَ حَسَبُهُ حَدِيدًا، فَقَعَدَ عَلَيْهِ، فَجَعَلَ يُعَلِّمُنِي مِمَّا عَلَّمَهُ اللَّهُ، ثُمَّ أَتَمَّ خُطْبَتَهُ، آخِرَهَا‏.‏