Musnad Ahmad 1153:1335

'Abd al-Razzaq narrated to us, Ibn Jurayj informed us, he said: 'Ata' informed me, from 'A'ishah, that she reported from the Prophet, may Allah bless him and grant him peace, and from her: "That they both would bathe together while they were in a state of major ritual impurity (junub) from a single vessel."