Sahih al-Bukhari 4883
صحيح البخاري#4883Sahihحَدَّثَنَا الْحَسَنُ بْنُ مُدْرِكٍ، حَدَّثَنَا يَحْيَى بْنُ حَمَّادٍ، أَخْبَرَنَا أَبُو عَوَانَةَ، عَنْ أَبِي بِشْرٍ، عَنْ سَعِيدٍ، قَالَ قُلْتُ لاِبْنِ عَبَّاسٍ ـ رضى الله عنهما ـ سُورَةُ الْحَشْرِ قَالَ قُلْ سُورَةُ النَّضِيرِ.
Narrated Sa`id:I asked Ibn `Abbas about Surat Al-Hashr. He replied, "Say Surat An-Nadir
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: 65:403