Taking Off One's Ring When Entering Al-Khala' (The Area in Which One Relieves Oneself) Sunan an-Nasa'i 5213

Arabic hadith text
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 كَانَإِذَا دَخَلَ الْخَلاَءَ نَزَعَ خَاتَمَهُ ‏.‏
Translation
It was narrated from Anas that

When entering the Khala', the Messenger of Allah [SAW] would take off his ring.