Sunan Ibn Majah
590
Hasan+2

It was narrated from Abu Rafi' that:The Prophet went around to all of his wives in one night, and he had a bath after each one of them. It was said to him: "O Messenger of Allah, why not make it one bath?" He said: "This is purer, better and cleaner

HasanAl-Albani
HasanMuhammad Fouad Abd al-Baqi