Sahih Muslim 350
Sahih Muslim · Book 3: The Book of Menstruation · Abrogation of “water is for water”, and that it is obligatory to perform ghusl when the two circumcised parts meet
'A'isha the wife of the Messenger of Allah (ﷺ) reported. A person asked the Messenger of Allah (ﷺ) about one who has sexual intercourse with his wife and parts away (without orgasm) whether bathing is obligatory for him. 'A'isha was sitting by him. The Messenger of Allah (ﷺ) said:
حَدَّثَنَا هَارُونُ بْنُ مَعْرُوفٍ ، وَهَارُونُ بْنُ سَعِيدٍ الأَيْلِيُّ ، قَالاَ حَدَّثَنَا ابْنُ وَهْبٍ ، أَخْبَرَنِي عِيَاضُ بْنُ عَبْدِ اللَّهِ ، عَنْ أَبِي الزُّبَيْرِ ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ ، عَنْ أُمِّ كُلْثُومٍ ، عَنْ عَائِشَةَ ، زَوْجِ النَّبِيِّ صلى الله عليه وسلم قَالَتْ إِنَّ رَجُلاً سَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنِ الرَّجُلِ يُجَامِعُ أَهْلَهُ ثُمَّ يُكْسِلُ هَلْ عَلَيْهِمَا الْغُسْلُ وَعَائِشَةُ جَالِسَةٌ . فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِنِّي لأَفْعَلُ ذَلِكَ أَنَا وَهَذِهِ ثُمَّ نَغْتَسِلُ " .
I and she (the Mother of the Faithful) do it and then take a bath.