Full Sharh — Ash-Shama'il Al-Muhammadiyah 90
حَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ أَبُو عَمْرٍو، قَالَ: حَدَّثَنَا نُوحُ بْنُ قَيْسٍ، عَنْ خَالِدِ بْنِ قَيْسٍ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم كَتَبَ إِلَى كِسْرَى وَقَيْصَرَ وَالنَّجَاشِيِّ، فَقِيلَ لَهُ: إِنَّهُمْ لا يَقْبَلُونَ كِتَابًا، إِلا بِخَاتَمٍ، فَصَاغَ رَسُولُ اللهِ صلى الله عليه وسلم، خَاتَمًا حَلْقَتُهُ فِضَّةٌ، وَنُقِشَ فِيهِ: مُحَمَّدٌ رَسُولُ اللهِ.
English Translation
Anas ibn Malik said:: "The Prophet (Allah bless him and give him peace) wrote to Chosroes, Caesar and the Negus, whereupon he was told: 'The non-Arabs will not accept a letter unless it bears a seal.' Allah’s Messenger (Allah bless him and give him peace) therefore cast a signet which had a silver ring, and on which was engraved; “Muhammad is the Messenger of Allah.”
Source
Ash-Shama'il Al-Muhammadiyah(الشمائل المحمدية)
The Mubarak Ring Of Rasoolullah
Hadith Number
90