The Book of Adornment
48/53. Chapter:
Taking Off One's Ring When Entering Al-Khala' (The Area in Which One Relieves Oneself)
Sunan an-Nasai
أَخْبَرَنَا مُحَمَّدُ بْنُ إِسْمَاعِيلَ بْنِ إِبْرَاهِيمَ، عَنْ سَعِيدِ بْنِ عَامِرٍ، عَنْ هَمَّامٍ، عَنِ ابْنِ جُرَيْجٍ، عَنِ الزُّهْرِيِّ، عَنْ أَنَسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ إِذَا دَخَلَ الْخَلاَءَ نَزَعَ خَاتَمَهُ .
It was narrated from Anas that: When entering the Khala', the Messenger of Allah [SAW] would take off his ring.
Reference : Sunan an-Nasa'i 5213In-book reference : Book 48, Hadith 174English translation : Vol. 6, Book 48, Hadith 5216