Muwatta Malik 44
موطأ مالك#44Sahihوَحَدَّثَنِي 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
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Salim al-HilaliSahih
In-book reference: 2:13