أَخْبَرَنَا شُعَيْبُ بْنُ يُوسُفَ، قَالَ حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، قَالَ أَنْبَأَنَا عَاصِمٌ، عَنْ عَمْرِو بْنِ سَلِمَةَ، قَالَ لَمَّا رَجَعَ قَوْمِي مِنْ عِنْدِ النَّبِيِّ صلى الله عليه وسلم قَالُوا إِنَّهُ قَالَ ‏"‏ لِيَؤُمَّكُمْ أَكْثَرُكُمْ قِرَاءَةً لِلْقُرْآنِ ‏"‏ ‏.‏ قَالَ فَدَعَوْنِي فَعَلَّمُونِي الرُّكُوعَ وَالسُّجُودَ فَكُنْتُ أُصَلِّي بِهِمْ وَكَانَتْ عَلَىَّ بُرْدَةٌ مَفْتُوقَةٌ فَكَانُوا يَقُولُونَ لأَبِي أَلاَ تُغَطِّي عَنَّا اسْتَ ابْنِكَ ‏.‏

It was narrated that 'Amr bin Salamah said: "When my people came back from the Prophet (PBUH)they said that he had said: 'Let the one who recites the Quran most lead you in prayer.' So they called me and taught me how to bow and prostrate, and I used to lead them in prayer, wearing a torn cloak, and they used to say to my father: 'Will you not conceal your son's backside from us?"' Translation Not Available

Book Ref: Sunan An Nisai Book 9 Hadith 767
Web Ref:  Sunan An Nisai Vol 1 Book 9 Hadith 768