Sunan an-Nasa'i 192
سنن النسائي#192Sahihأَخْبَرَنَا إِبْرَاهِيمُ بْنُ يَعْقُوبَ بْنِ إِسْحَاقَ الْجُوزَجَانِيُّ، قَالَ حَدَّثَنِي عَبْدُ اللَّهِ بْنُ يُوسُفَ، قَالَ حَدَّثَنَا عِيسَى بْنُ يُونُسَ، قَالَ حَدَّثَنَا أَشْعَثُ بْنُ عَبْدِ الْمَلِكِ، عَنِ ابْنِ سِيرِينَ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا قَعَدَ بَيْنَ شُعَبِهَا الأَرْبَعِ ثُمَّ اجْتَهَدَ فَقَدْ وَجَبَ الْغُسْلُ " . قَالَ أَبُو عَبْدِ الرَّحْمَنِ هَذَا خَطَأٌ وَالصَّوَابُ أَشْعَثُ عَنِ الْحَسَنِ عَنْ أَبِي هُرَيْرَةَ . وَقَدْ رَوَى الْحَدِيثَ عَنْ شُعْبَةَ النَّضْرُ بْنُ شُمَيْلٍ وَغَيْرُهُ كَمَا رَوَاهُ خَالِدٌ .
It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said:"When (a man) sits between the four parts of his wife's body and exerts himself, then Ghusl becomes obligatory." Abu 'Abdur-Rahman said: "This is a mistake what is correct is; 'Ash'ath from Al-Hasan, from Abu Hurairah.' An-Nadr bin Shumail, and others, reported the Hadith from Shu'bah just as Khalid reported 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:
In-book reference: 1:193