Sahih Muslim Book - 3, Hadith - 785

و حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى حَدَّثَنَا مُحَمَّدُ بْنُ عِبْدِ اللَّهِ الْأَنْصَارِيُّ حَدَّثَنَا هِشَامُ بْنُ حَسَّانَ حَدَّثَنَا حُمَيْدُ بْنُ هِلَالٍ عَنْ أَبِي بُرْدَةَ عَنْ أَبِي مُوسَى الْأَشْعَرِيِّ ح و حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى حَدَّثَنَا عَبْدُ الْأَعْلَى وَهَذَا حَدِيثُهُ حَدَّثَنَا هِشَامٌ عَنْ حُمَيْدِ بْنِ هِلَالٍ قَالَ وَلَا أَعْلَمُهُ إِلَّا عَنْ أَبِي بُرْدَةَ عَنْ أَبِي مُوسَى قَالَ اخْتَلَفَ فِي ذَلِكَ رَهْطٌ مِنْ الْمُهَاجِرِينَ وَالْأَنْصَارِ فَقَالَ الْأَنْصَارِيُّونَ لَا يَجِبُ الْغُسْلُ إِلَّا مِنْ الدَّفْقِ أَوْ مِنْ الْمَاءِ وَقَالَ الْمُهَاجِرُونَ: بَلْ إِذَا خَالَطَ فَقَدْ وَجَبَ الْغُسْلُ قَالَ قَالَ أَبُو مُوسَى فَأَنَا أَشْفِيكُمْ مِنْ ذَلِكَ، فَقُمْتُ فَاسْتَأْذَنْتُ عَلَى عَائِشَةَ فَأُذِنَ لِي فَقُلْتُ لَهَا يَا أُمَّاهْ أَوْ يَا أُمَّ الْمُؤْمِنِينَ إِنِّي أُرِيدُ أَنْ أَسْأَلَكِ عَنْ شَيْءٍ وَإِنِّي أَسْتَحْيِيْكِ فَقَالَتْ لَا تَسْتَحْيِي أَنْ تَسْأَلَنِي عَمَّا كُنْتَ سَائِلًا عَنْهُ أُمَّكَ الَّتِي وَلَدَتْكَ فَإِنَّمَا أَنَا أُمُّكَ قُلْتُ فَمَا يُوجِبُ الْغُسْلَ قَالَتْ عَلَى الْخَبِيرِ سَقَطْتَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا جَلَسَ بَيْنَ شُعَبِهَا الْأَرْبَعِ وَمَسَّ الْخِتَانُ الْخِتَانَ فَقَدْ وَجَبَ الْغُسْلُ.

It was narrated that Abu Musa said: "A group of the Muhajireen and Ansar differed concerning that. The Ansar said: 'Ghusl is not mandatory unless semen spurts forth or there is water (emission of fluid).' The Muhajirun said: 'When he has intercourse, Ghusl is mandatory.' Abu Musa said: 'I will answer you concerning that'. I went and asked permission to enter upon 'Aishah, and permission was granted to me. I said to her: 'O my mother' - or, 'O Mother of the Believers' - 'I want to ask you about something but I feel shy.' She said: 'Do not feel too shy to ask me anything that you would ask your mother who gave birth to you, for I am your mother.' I said: 'What necessitates Ghusl?' She said: 'You have come to one who knows about that. The Messenger of Allah (s.a.w) said: 'When a man sits between the four parts and the two circumcised parts meet, then Ghusl is obligatory."'