Sunan Ibn Majah, Volume 4, Book 32, Hadith 3639 (DarusSalam) ⓘ

It was narrated that Ibn ‘Umar said: “The Messenger of Allah wore a ring of silver, then he had engraved on it (the words) ‘Muhammad Rasul Allah’ (Muhammad the Messenger of Allah). And he said: ‘No one should have his ring engraved like this ring of mine.’”

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ أَيُّوبَ بْنِ مُوسَى، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ اتَّخَذَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ خَاتَمًا مِنْ وَرِقٍ ثُمَّ نَقَشَ فِيهِ مُحَمَّدٌ رَسُولُ اللَّهِ فَقَالَ ‏ "‏ لاَ يَنْقُشْ أَحَدٌ عَلَى نَقْشِ خَاتَمِي هَذَا ‏" ‏ ‏.‏