مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 343
Purification
How to act when relieving oneself - Section 2
عَنْ أَنَسٍ قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا دَخَلَ الْخَلَاءَ نَزَعَ خَاتَمَهُ. رَوَاهُ أَبُو دَاوُدَ وَالنَّسَائِيُّ وَالتِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ وَقَالَ أَبُو دَاوُدَ: هَذَا حَدِيثٌ مُنْكَرٌ. وَفِي رِوَايَتِهِ وَضَعَ بَدَلَ نزع
Anas said that when the Prophet (ﷺ) entered the privy he took off his ring. Abu Dawud, Nasa’i and Tirmidhi transmitted it. Tirmidhi said this is a hasan sahih gharib tradition, and Abu Dawud said this is a rejected (munkar) tradition. His version has "laid down” instead of "took off".
Mishkat al-Masabih, 343ضَعِيف (الألباني)