"When (a man) sits between the four parts of his wife's body and exerts himself, then Ghusl becomes obligatory."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا جَلَسَ بَيْنَ شُعَبِهَا الأَرْبَعِ ثُمَّ اجْتَهَدَ فَقَدْ وَجَبَ الْغُسْلُ  

"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."  

أَنَّ رَسُولَ اللَّهِ ﷺ 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