Hadithcore
Sahih al-Bukhari, 5875
sahih

Narrated Anas bin Malik:

When the Prophet (ﷺ) intended to write to the Byzantines, it was said to him, "Those people do not read your letter unless it is stamped." So the Prophet (ﷺ) took a silver ring and got 'Muhammad, the Messenger of Allah' engraved on it .... as if I am now looking at its glitter in his hand.

حَدَّثَنَا آدَمُ بْنُ أَبِي إِيَاسٍ، حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ ـ رضى الله عنه ـ قَالَ لَمَّا أَرَادَ النَّبِيُّ صلى الله عليه وسلم أَنْ يَكْتُبَ إِلَى الرُّومِ قِيلَ لَهُ إِنَّهُمْ لَنْ يَقْرَءُوا كِتَابَكَ إِذَا لَمْ يَكُنْ مَخْتُومًا‏.‏ فَاتَّخَذَ خَاتَمًا مِنْ فِضَّةٍ، وَنَقْشُهُ مُحَمَّدٌ رَسُولُ اللَّهِ‏.‏ فَكَأَنَّمَا أَنْظُرُ إِلَى بَيَاضِهِ فِي يَدِهِ‏.‏

References2 variants
In-Book Reference
Book 77, Hadith 92
USC-MSA web (English) reference
Vol. 7, Book 72, Hadith 764 (deprecated numbering scheme)
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