(53) باب نَزْعِ الْخَاتَمِ عِنْدَ دُخُولِ الْخَلاَءِ
It was narrated that Ibn 'Umar said:
"The Prophet [SAW] used to wear a ring of gold, then he discarded it, and put on a ring of silver on which was engraved (the words): 'Muhammad Rasul Allah.' He said: 'No one else should engrave his ring with an inscription like this ring of mine.' Then he put the stone toward the palm of his hand."
Reference: Sunan an-Nasa'i 5216
In-book reference: Book 48, Hadith 177
English translation: Vol. 6, Book 48, Hadith 5219