Muwatta Malik 44
Sahih Graded by Salim al-Hilali Book of Purity · Hadith 44 of 1,858وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ إِنْ كَانَ الرِّجَالُ وَالنِّسَاءُ فِي زَمَانِ رَسُولِ اللَّهِ صلى الله عليه وسلم لَيَتَوَضَّئُونَ جَمِيعًا .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar used to say that men and their wives used to do wudu together in the time of the Messenger of Allah
References
Muwatta Malik 44
In-book: Book 2, Hadith 13 Source: hadith-api (fawazahmed0)