Hot Baths (Kitab Al-Hammam)

Dawud :: Book 31 : Hadith 4001

Narrated Ya'la:

The Apostle of Allah (peace_be_upon_him) saw a man washing in a public place without a lower garment. So he mounted the pulpit, praised and extolled Allah and said: Allah is characterised by modesty and concealment. So when any of you washes, he should conceal himself.