Sunan an-Nasa'i 401
سنن النسائي#401SahihIt 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)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiHasan
In-book reference: 4:6