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bukhari:5872 – ʿAbd al-Aʿlá > Yazīd b. Zurayʿ > Saʿīd > Qatādah > Anas b. Mālik > Nabī Allāh ﷺ Arād

Messenger of Allah ﷺ wanted to write a letter to a group of people or some non-Arabs. It was said to him, "They do not accept any letter unless it is stamped." So the Prophet ﷺ had a silver ring made for himself, and on it was engraved: 'Muhammad, the Messenger of Allah'. .. as if I am now looking at the glitter of the ring on the finger (or in the palm) of the Prophet ﷺ .  

البخاري:٥٨٧٢ – حَدَّثَنَا عَبْدُ الأَعْلَى حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ حَدَّثَنَا سَعِيدٌ عَنْ قَتَادَةَ عَنْ أَنَسِ بْنِ مَالِكٍ ؓ

أَنَّ نَبِيَّ اللَّهِ ﷺ أَرَادَ أَنْ يَكْتُبَ إِلَى رَهْطٍ أَوْ أُنَاسٍ مِنَ الأَعَاجِمِ فَقِيلَ لَهُ إِنَّهُمْ لاَ يَقْبَلُونَ كِتَابًا إِلاَّ عَلَيْهِ خَاتَمٌ فَاتَّخَذَ النَّبِيُّ ﷺ خَاتَمًا مِنْ فِضَّةٍ نَقْشُهُ مُحَمَّدٌ رَسُولُ اللَّهِ فَكَأَنِّي بِوَبِيصِ أَوْ بِبَصِيصِ الْخَاتَمِ فِي إِصْبَعِ النَّبِيِّ ﷺ أَوْ فِي كَفِّهِ  

See similar narrations below:

Collected by Abū Dāwūd, Aḥmad
abudawud:4214 – ʿAbd al-Raḥīm b. Muṭarrif al-Ruʾāsī > ʿĪsá > Saʿīd > Qatādah > Anas b. Mālik

The Messenger of Allah ﷺ wanted to write to some persian rulers. He was told that they would not read a letter without a seal in the form of a silver ring on which he engraved "Muhammad the Messenger of Allah."  

أبو داود:٤٢١٤ – حَدَّثَنَا عَبْدُ الرَّحِيمِ بْنُ مُطَرِّفٍ الرُّؤَاسِيُّ حَدَّثَنَا عِيسَى عَنْ سَعِيدٍ عَنْ قَتَادَةَ عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ

أَرَادَ رَسُولُ اللَّهِ ﷺ أَنْ يَكْتُبَ إِلَى بَعْضِ الأَعَاجِمِ فَقِيلَ لَهُ إِنَّهُمْ لاَ يَقْرَءُونَ كِتَابًا إِلاَّ بِخَاتَمٍ فَاتَّخَذَ خَاتَمًا مِنْ فِضَّةٍ وَنَقَشَ فِيهِ مُحَمَّدٌ رَسُولُ اللَّهِ  

ahmad:13046 – Muḥammad b. Bishr > Saʿīd b. Abū ʿArūbah > Qatādah > Anas b. Mālik

The Messenger of Allah ﷺ wanted to write to some persian rulers. He was told that they would not read a letter without a seal in the form of a silver ring on which he engraved "Muhammad the Messenger of Allah." (Using translation from Abū Dāʾūd 4214)   

أحمد:١٣٠٤٦ – حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ حَدَّثَنَا سَعِيدُ بْنُ أَبِي عَرُوبَةَ عَنْ قَتَادَةَ عَنْ أَنَسِ بْنِ مَالِكٍ حَدَّثَهُمْ

أَنَّ رَسُولَ اللهِ ﷺ أَرَادَ أَنْ يَكْتُبَ إِلَى الْأَعَاجِمِ فَقِيلَ إِنَّهُمْ لَا يَقْبَلُونَ كِتَابًا إِلَّا بِنَقْشٍ فَاتَّخَذَ رَسُولُ اللهِ ﷺ خَاتَمًا مِنْ فِضَّةٍ وَنَقَشَ فِيهِ مُحَمَّدٌ رَسُولُ اللهِ  

ahmad:12738 – Muḥammad b. Jaʿfar > Saʿīd And Muḥammad b. Bakrqāl > Saʿīd > Qatādah > Anas b. Mālik

[Machine] "When the Messenger of Allah ﷺ wanted to write to some non-Arabs, it was said to him that they do not accept a letter without a seal. So, he took a silver seal with the engraving '[This is] the seal of Muhammad, the Messenger of Allah.' It is as if I am looking at its shine or brilliance in the hand of the Messenger of Allah ﷺ."  

أحمد:١٢٧٣٨ – حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا سَعِيدٌ وَمُحَمَّدُ بْنُ بَكْرٍقَالَ أَخْبَرَنَا سَعِيدٌ عَنْ قَتَادَةَ عَنْ أَنَسِ بْنِ مَالِكٍ

أَنَّ رَسُولَ اللهِ ﷺ لَمَّا أَرَادَ أَنْ يَكْتُبَ إِلَى نَاسٍ مِنْ هَذِهِ الْأَعَاجِمِ قِيلَ لَهُ إِنَّهُمْ لَا يَقْبَلُونَ كِتَابًا إِلَّا بِخَاتَمٍ قَالَ فَاتَّخَذَ خَاتَمًا مِنْ فِضَّةٍ نَقْشُهُ وَقَالَ ابْنُ بَكْرٍ وَنَقْشُهُ مُحَمَّدٌ رَسُولُ اللهِ كَأَنِّي أَنْظُرُ إِلَى بَصِيصِهِ أَوْ وَبِيصِهِ فِي يَدِ رَسُولِ اللهِ ﷺ