كتاب الطهارة وسننها
1  
The Book of Purification and its Sunnah
(34)
Chapter: The prohibition of that (i.e., performing ablution with the leftover water)
(34)
باب النَّهْىِ عَنْ ذَلِكَ
Sunan Ibn Majah 374
It was narrated that `Abdullah bin Sarjis said:
"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 `Abdullah Ibn Majah said: "The first (narration) is correct, and the second (narration) is Wahm (an error)." Another chain with similar wording.
حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى، حَدَّثَنَا الْمُعَلَّى بْنُ أَسَدٍ، حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ الْمُخْتَارِ، حَدَّثَنَا عَاصِمٌ الأَحْوَلُ، عَنْ عَبْدِ اللَّهِ بْنِ سَرْجِسَ، قَالَ نَهَى رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ 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 ‏.‏

Grade: Sahih (Darussalam)
Reference : Sunan Ibn Majah 374
In-book reference : Book 1, Hadith 108
English translation : Vol. 1, Book 1, Hadith 374