´It was narrated that Jabir bin 'Abdullah said:` "The Messenger of Allah and his wives used to take a bath from a single vessel."
Explanation & Benefits
Maulana Ataullah Sajid
The meaning is that the Mother of the Believers (Umm al-Mu’minin) in whose house the Messenger of Allah (sallallahu alayhi wa sallam) would perform ritual bath (ghusl), she would also perform ritual bath (ghusl) with him from the same vessel.
This does not mean that more than one of the purified wives (azwaj mutahharat, radi Allahu anhunna) would perform ritual bath together at the same time, because a woman must conceal from another woman those parts of the body which it is not necessary to conceal from her husband.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 379