Sahih al-Bukhari 738
صحيح البخاري#738Sahihحَدَّثَنَا أَبُو الْيَمَانِ، قَالَ أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، قَالَ أَخْبَرَنَا سَالِمُ بْنُ عَبْدِ اللَّهِ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ ـ رضى الله عنهما ـ قَالَ رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم افْتَتَحَ التَّكْبِيرَ فِي الصَّلاَةِ، فَرَفَعَ يَدَيْهِ حِينَ يُكَبِّرُ حَتَّى يَجْعَلَهُمَا حَذْوَ مَنْكِبَيْهِ، وَإِذَا كَبَّرَ لِلرُّكُوعِ فَعَلَ مِثْلَهُ، وَإِذَا قَالَ سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ. فَعَلَ مِثْلَهُ وَقَالَ " رَبَّنَا وَلَكَ الْحَمْدُ ". وَلاَ يَفْعَلُ ذَلِكَ حِينَ يَسْجُدُ وَلاَ حِينَ يَرْفَعُ رَأْسَهُ مِنَ السُّجُودِ.
Narrated `Abdullah bin `Umar:I saw Allah's Messenger (ﷺ) opening the prayer with the Takbir and raising his hands to the level of his shoulders at the time of saying the Takbir, and on saying the Takbir for bowing he did the same; and when he said, "Sami`a l-lahu liman hamidah ", he did the same and then said, "Rabbana wa laka lhamd." But he did not do the same on prostrating and on lifting the head from it
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: 10:132