(30) باب إِثْبَاتِ خَاتَمِ النُّبُوَّةِ وَصِفَتِهِ وَمَحِلِّهِ مِنْ جَسَدِهِ صلى الله عليه وسلم .
As-Sa'ib b. Yazid reported:
My mother's sister took me to Allah's Messenger (ﷺ) and said: Allah's Messenger, here is the son of my sister and he is ailing. He touched my head and invoked blessings upon me. He then performed ablution and I drank the water left from his ablution; then I stood behind him and I saw the seal between his shoulders.
Reference: Sahih Muslim 2345
In-book reference: Book 43, Hadith 145
USC-MSA web (English) reference(deprecated numbering scheme): Book 30, Hadith 5792