Ash-Shama'il Al-Muhammadiyah, Book 2, Hadith 22 (In-Book) ⓘ
Abi Nadrah AI-'Awfee RA. reports: "I asked Abu Sa'eed Khudari Radiyallahu 'Anhu about the Seal of Prophethood of Rasulullah sallailahu 'Alayhi Wasallam. He said: 'It was a piece of raised flesh that was on Rasulullah Sallallahu 'Alayhi Wasallam's back".
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ: حَدَّثَنَا بِشْرُ بْنُ الْوَضَّاحِ، قَالَ: حَدَّثَنَا أَبُو عَقِيلٍ الدَّوْرَقِيُّ، عَنْ أَبِي نَضْرَةَ الْعَوَقِيِّ، قَالَ: سَأَلْتُ أَبَا سَعِيدٍ الْخُدْرِيَّ، عَنْ خَاتَمِ رَسُولِ اللهِ صلى الله عليه وسلم يَعْنِي خَاتَمَ النُّبُوَّةِ، فَقَالَ: كَانَ فِي ظَهْرِهِ بَضْعَةٌ نَاشِزَةٌ.
also referenced under: Book 2, Hadith 21 (English)