It is narrated from Sayyiduna Abu Ayyub al-Ansari (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever believes in Allah and the Last Day, let him honour his guest; whoever believes in Allah and the Last Day, let him honour his neighbour; whoever believes in Allah and the Last Day, let him not enter the bathhouse except with a waist-wrapper; and whoever among your women believes in Allah and the Last Day, let her not enter the bathhouse."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3858