(2) باب الرُّخْصَةِ فِي دُخُولِ الْحَمَّامِ
It was narrated from Jabir that the Prophet (ﷺ) said:
"Whoever believes in Allah and the Last Day, let him not enter a bath house except wearing an Izar (waist wrap)."
Reference: Sunan an-Nasa'i 401
In-book reference: Book 4, Hadith 6
English translation: Vol. 1, Book 4, Hadith 401