Virtues and Merits of the Prophet (pbuh) and his Companions
حَدَّثَنَا مُحَمَّدُ بْنُ عُبَيْدِ اللَّهِ، حَدَّثَنَا حَاتِمٌ، عَنِ الْجُعَيْدِ بْنِ عَبْدِ الرَّحْمَنِ، قَالَ سَمِعْتُ السَّائِبَ بْنَ يَزِيدَ، قَالَ ذَهَبَتْ بِي خَالَتِي إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَتْ يَا رَسُولَ اللَّهِ إِنَّ ابْنَ أُخْتِي. وَقَعَ فَمَسَحَ رَأْسِي وَدَعَا لِي بِالْبَرَكَةِ، وَتَوَضَّأَ فَشَرِبْتُ مِنْ وَضُوئِهِ، ثُمَّ قُمْتُ خَلْفَ ظَهْرِهِ فَنَظَرْتُ إِلَى خَاتَمٍ بَيْنَ كَتِفَيْهِ. قَالَ ابْنُ عُبَيْدِ اللَّهِ الْحُجْلَةُ مِنْ حُجَلِ الْفَرَسِ الَّذِي بَيْنَ عَيْنَيْهِ. قَالَ إِبْرَاهِيمُ بْنُ حَمْزَةَ مِثْلَ زِرِّ الْحَجَلَةِNarrated As-Sa'ib bin Yazid:My aunt took me to Allah's Messenger (ﷺ) and said, "O Allah's Messenger (ﷺ)! My nephew is sick."' The Prophet (ﷺ) passed his hands over my head and blessed me. Then he performed ablution and I drank the remaining water, and standing behind him, I saw the seal in between his shoulders
From Sahih al-Bukhari, whose reports the scholars accept as authentic.