عَنْ أَنَسِ بْنِ مَالِكٍ رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَانَ يَطُوفُ عَلَى جَمِيعِ نِسَائِهِ فِي لَيْلَةٍ (وَفِي رِوَايَةٍ: فِي لَيْلَةٍ وَاحِدَةٍ) بِغُسْلٍ وَاحِدٍ
It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) would go to all his wives in one night (having intercourse with them, and at the end) would perform one ghusl (ritual bath).