1. Purification
١۔ كتاب الطهارة وسننها
The Messenger of Allah forbade men to perform ablution with the left over water by a woman.
أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى أَنْ يَتَوَضَّأَ الرَّجُلُ بِفَضْلِ وَضُوءِ الْمَرْأَةِ
"The Messenger of Allah forbade men to perform ablution with the water left over by a woman, and women to perform ablution with water left over by a man, however both (spouses) may start to perform their ablutions at the same time." Abu ʿAbdullah Ibn Majah said: "The first (narration) is correct, and the second (narration) is Wahm (an error)." Another chain with similar wording.
نَهَى رَسُولُ اللَّهِ ﷺ أَنْ يَغْتَسِلَ الرَّجُلُ بِفَضْلِ وَضُوءِ الْمَرْأَةِ وَالْمَرْأَةُ بِفَضْلِ الرَّجُلِ وَلَكِنْ يَشْرَعَانِ جَمِيعًا قَالَ أَبُو عَبْدِ اللَّهِ بْنُ مَاجَهْ الصَّحِيحُ هُوَ الأَوَّلُ وَالثَّانِي وَهَمٌ قَالَ أَبُو الْحَسَنِ بْنُ سَلَمَةَ حَدَّثَنَا أَبُو حَاتِمٍ وَأَبُو عُثْمَانَ الْبُخَارِيُّ قَالاَ حَدَّثَنَا الْمُعَلَّى بْنُ أَسَدٍ نَحْوَهُ
"The Prophet and his wife would take a bath from one vessel, but neither of them would have a bath with the leftover water of the other." (Daif)
كَانَ النَّبِيُّ ﷺ وَأَهْلُهُ يَغْتَسِلُونَ مِنْ إِنَاءٍ وَاحِدٍ وَلاَ يَغْتَسِلُ أَحَدُهُمَا بِفَضْلِ صَاحِبِهِ