Ibn Tawus narrates from his father that the Messenger of Allah (peace and blessings be upon him) said: "Beware of the houses called bathhouses." It was said: They remove dirt and are beneficial. He said: "Whoever enters them should enter covered."
Sulayman said: Abu Nu'aym and others narrated it thus, as disconnected (maqtu'), while Ya'la bin Ubayd narrated it as connected (mawsul).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسم والنشوز / 14805