Sahih al-Bukhari 1836
صحيح البخاري#1836Sahihحَدَّثَنَا خَالِدُ بْنُ مَخْلَدٍ، حَدَّثَنَا سُلَيْمَانُ بْنُ بِلاَلٍ، عَنْ عَلْقَمَةَ بْنِ أَبِي عَلْقَمَةَ، عَنْ عَبْدِ الرَّحْمَنِ الأَعْرَجِ، عَنِ ابْنِ بُحَيْنَةَ ـ رضى الله عنه ـ قَالَ احْتَجَمَ النَّبِيُّ صلى الله عليه وسلم وَهْوَ مُحْرِمٌ بِلَحْىِ جَمَلٍ فِي وَسَطِ رَأْسِهِ.
Narrated Ibn Buhaina:The Prophet, while in the state of Ihram, was cupped at the middle of his head at Liha-Jamal
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 28:16