It was narrated from Anas bin Malik that the Messenger of Allah ﷺ went around all his wives and only performed Ghusl once.  

أَنَّ رَسُولَ اللَّهِ ﷺ طَافَ عَلَى نِسَائِهِ فِي لَيْلَةٍ بِغُسْلٍ وَاحِدٍ  

It was narrated from Anas that the Messenger of Allah ﷺ used to (go around) all his wives and perform Ghusl once.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَطُوفُ عَلَى نِسَائِهِ فِي غُسْلٍ وَاحِدٍ