Musnad Ahmad 1153:1439

'Abd al-Rahman narrated to us, he said: Hammad ibn Salamah narrated to us, from 'Abdullah ibn Shaddad, from Abu 'Udrah—and he had met the Prophet, may Allah bless him and grant him peace—from 'Aishah: "That the Messenger of Allah, may Allah bless him and grant him peace, forbade men and women from the bathhouses. Then he granted a concession to men regarding [wearing] waist-wrappers."