Mishkat al-Masabih 29 Excellent Qualities and Description of the Prophet كتاب الفضائل والشمائل 40

وَعَن عبدِ الله بن سرجسٍ قَالَ: رَأَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَأَكَلْتُ مَعَهُ خُبْزًا وَلَحْمًا – أَوْ قَالَ: ثَرِيدًا – ثُمَّ دُرْتُ خَلْفَهُ فَنَظَرْتُ إِلَى خَاتَمِ النُّبُوَّةِ بَيْنَ كَتِفَيْهِ عِنْدَ نَاغِضِ كَتِفِهِ الْيُسْرَى جُمْعًا عَلَيْهِ خيلال كأمثال الثآليل. رَوَاهُ مُسلم

`Abdullah b. Sarjis told that he had seen the Prophet and had eaten bread and meat along with him (or he said tharid ). He had then gone round behind him and looked at the seal of prophecy between his shoulders at the end of his left shoulder-blade, a collection of moles on him like warts. Muslim transmitted it.