Sahih al-Bukhari 193
Sahih al-Bukhari · Book 4: Ablutions (Wudu') · 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:
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.
"During the lifetime of Allah's Messenger (ﷺ) men and women used to perform ablution together."