Ash-Shama'il Al-Muhammadiyah, Book 2, Hadith 18 (English) ⓘ

Ebrahim bin Muhammad (Radhiallahu Anhu), who is the grandson of Ali (Radhiallahu anhu said: "Whenever Ali (Radhiallahu Anhu) used to describe the noble attributes of Rasullullah (Sallallahu Alaihi wasallam), he used to mentioned the complete hadith. He also used to say that the Seal of Prophethood was between his shoulders, and Rasullullah (Sallallahu alaihi wasallam) was the seal of all prophets".

حَدَّثَنَا أَحْمَدُ بْنُ عَبْدَةَ الضَّبِّيُّ، وَعَلِيُّ بْنُ حُجْرٍ، وَغَيْرُ وَاحِدٍ، قَالُوا‏:‏ حَدَّثَنَا عِيسَى بْنُ يُونُسَ، عَنْ عُمَرَ بْنِ عَبْدِ اللهِ مَوْلَى غُفْرَةَ، قَالَ‏:‏ حَدَّثَنِي إِبْرَاهِيمُ بْنُ مُحَمَّدٍ مِنْ وَلَدِ عَلِيِّ بْنِ أَبِي طَالِبٍ، قَالَ‏:‏ كَانَ عَلِيٌّ، إِذَا وَصَفَ رَسُولَ اللهِ صلى الله عليه وسلم فَذَكَرَ الْحَدِيثَ بِطُولِهِ، وَقَالَ‏:‏ بَيْنَ كَتِفَيْهِ خَاتَمُ النُّبُوَّةِ، وَهُوَ خَاتَمُ النَّبِيِّينَ‏.‏