(7) باب الاِسْتِتَارِ عِنْدَ الاِغْتِسَالِ
It was narrated from Ya'la that the Messenger of Allah (ﷺ) saw a man performing Ghusl in an open place, so he ascended the Minbar and praised and glorified Allah, then he said:
'Allah, the Mighty and Sublime, is forbearing, modest and concealing, and He loves modesty and concealment. When any one of you performs Ghusl, let him conceal himself.'"
Reference: Sunan an-Nasa'i 406
In-book reference: Book 4, Hadith 11
English translation: Vol. 1, Book 4, Hadith 406