Sahih al-Bukhari 1746
صحيح البخاري#1746Sahihحَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا مِسْعَرٌ، عَنْ وَبَرَةَ، قَالَ سَأَلْتُ ابْنَ عُمَرَ ـ رضى الله عنهما ـ مَتَى أَرْمِي الْجِمَارَ قَالَ إِذَا رَمَى إِمَامُكَ فَارْمِهْ. فَأَعَدْتُ عَلَيْهِ الْمَسْأَلَةَ، قَالَ كُنَّا نَتَحَيَّنُ، فَإِذَا زَالَتِ الشَّمْسُ رَمَيْنَا.
Narrated Wabra:I asked Ibn `Umar, "When should I do the Rami of the Jimar?" He replied, "When your leader does that." I asked him again the same question. He replied, "We used to wait till the sun declined and then we would do the Rami (i.e. on the 11th and 12th of Dhul-Hijja)
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: 25:224