Arabic (Original)
حَدَّثَنَا يَحْيَى عَنِ أَشْعَثَ عَنِ الْحَسَنِ عَنِ أَبِي هُرَيْرَةَ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِذَا جَلَسَ بَيْنَ شُعَبِهَا الْأَرْبَعِ وَاجْتَهَدَ فَقَدْ وَجَبَ الْغُسْلُ.
English Translation
Yahya narrated to us, from Ash'ath, from al-Hasan, from Abu Hurayrah, from the Prophet (peace and blessings be upon him), who said: 'When he sits between her four limbs and exerts himself [in intercourse], then bathing (ghusl) becomes obligatory.'