The performance of ablution by a man along with his wife. The utilization of water remaining after a woman has performed ablution. Umar performed ablution with warm water and with water brought from the house of a Christian woman

Narrated 'Abdullah bin 'Umar:

"During the lifetime of Allah's Messenger (ﷺ) men and women used to perform ablution together."

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، قَالَ أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ قَالَ كَانَ الرِّجَالُ وَالنِّسَاءُ يَتَوَضَّئُونَ فِي زَمَانِ رَسُولِ اللَّهِ صلى الله عليه وسلم جَمِيعًا‏.‏