It is narrated from Sayyiduna al-Miqdam bin Ma'di Karib (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "You will soon conquer many lands in which there will be buildings called bathhouses (hammams). Entering them is unlawful for my Ummah." The people said: "O Messenger of Allah, they remove fatigue and clean away dirt." He (peace and blessings be upon him) said: "Then they are lawful for the men of my Ummah with waist-wrappers, and unlawful for the women of my Ummah."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17805