The Book of Purification
1/170. Chapter:
Having Intercourse With Women Before Performing Ghusl
Sunan an-Nasai
أَخْبَرَنَا مُحَمَّدُ بْنُ عُبَيْدٍ، قَالَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ الْمُبَارَكِ، قَالَ أَنْبَأَنَا مَعْمَرٌ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَطُوفُ عَلَى نِسَائِهِ فِي غُسْلٍ وَاحِدٍ .
It was narrated from Anas that the Messenger of Allah (ﷺ) used to (go around) all his wives and perform Ghusl once.
Reference : Sunan an-Nasa'i 264In-book reference : Book 1, Hadith 265English translation : Vol. 1, Book 1, Hadith 265