Musannaf Ibn Abi Shayba 1:1183

Affan narrated to us, he said: Hammad bin Salamah narrated to us, he said: Abdullah bin Shaddad informed us, from Abu Urwah—and he had reached the Prophet, may God bless him and grant him peace—from Aisha, that the Prophet, may God bless him and grant him peace, forbade men and women from [entering] the bathhouses, except for a sick woman or a woman in her postpartum period.