Sahih al-Bukhari 1096
صحيح البخاري#1096Sahihحَدَّثَنَا مُوسَى، قَالَ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ مُسْلِمٍ، قَالَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ دِينَارٍ، قَالَ كَانَ عَبْدُ اللَّهِ بْنُ عُمَرَ ـ رضى الله عنهما ـ يُصَلِّي فِي السَّفَرِ عَلَى رَاحِلَتِهِ، أَيْنَمَا تَوَجَّهَتْ يُومِئُ. وَذَكَرَ عَبْدُ اللَّهِ أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يَفْعَلُهُ.
Narrated `Abdullah bin Dinar:On traveling, `Abdullah bin `Umar used to offer the prayer on his Mount by signs whatever direction it took. `Abdullah said that the Prophet (ﷺ) used to do so
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: 18:16