(10) باب الرُّخْصَةِ فِي فَضْلِ الْمَرْأَةِ
It was narrated that Ibn 'Umar said:
"Men and women used to perform Wudu' together during the time of the Messenger of Allah (ﷺ)."
Reference: Sunan an-Nasa'i 342
In-book reference: Book 2, Hadith 18
English translation: Vol. 1, Book 2, Hadith 343