Sahih al-Bukhari 291
صحيح البخاري#291Sahihحَدَّثَنَا مُعَاذُ بْنُ فَضَالَةَ، قَالَ حَدَّثَنَا هِشَامٌ، ح وَحَدَّثَنَا أَبُو نُعَيْمٍ، عَنْ هِشَامٍ، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، عَنْ أَبِي رَافِعٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِذَا جَلَسَ بَيْنَ شُعَبِهَا الأَرْبَعِ ثُمَّ جَهَدَهَا، فَقَدْ وَجَبَ الْغَسْلُ ". تَابَعَهُ عَمْرُو بْنُ مَرْزُوقٍ عَنْ شُعْبَةَ مِثْلَهُ. وَقَالَ مُوسَى حَدَّثَنَا أَبَانُ قَالَ حَدَّثَنَا قَتَادَةُ أَخْبَرَنَا الْحَسَنُ مِثْلَهُ.
Narrated Hisham:as the following Hadith 290. Narrated Abu Huraira: The Prophet (ﷺ) said, "When a man sits in between the four parts of a woman and did the sexual intercourse with her, bath becomes compulsory
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: 5:43