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bukhari:3106Muḥammad b. ʿAbdullāh al-Anṣārī from my father > Thumāmah > Anas from my father

That when Abu Bakr became the Caliph, he sent him to Bahrain and wrote this letter for him, and stamped it with the Ring of the Prophet. Three lines were engraved on the Ring, (the word) 'Muhammad' was in a line, 'Apostle' was in another line, and 'Allah' in a third.  

البخاري:٣١٠٦حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ الأَنْصَارِيُّ قَالَ حَدَّثَنِي أَبِي عَنْ ثُمَامَةَ عَنْ أَنَسٍ

أَنَّ أَبَا بَكْرٍ ؓ لَمَّا اسْتُخْلِفَ بَعَثَهُ إِلَى الْبَحْرَيْنِ وَكَتَبَ لَهُ هَذَا الْكِتَابَ وَخَتَمَهُ وَكَانَ نَقْشُ الْخَاتَمِ ثَلاَثَةَ أَسْطُرٍ مُحَمَّدٌ سَطْرٌ وَرَسُولُ سَطْرٌ وَاللَّهِ سَطْرٌ  


See similar narrations below:

Collected by Bukhārī, Ibn Ḥibbān
bukhari:5878Muḥammad b. ʿAbdullāh al-Anṣārī from my father > Thumāmah > Anas from my father

that when Abu Bakr became the Caliph, he wrote a letter to him (and stamped it with the Prophet's ring) and the engraving of the ring was in three lines: Muhammad in one line, 'Apostle' in another line, and 'Allah' in a third line.  

البخاري:٥٨٧٨حَدَّثَنِي مُحَمَّدُ بْنُ عَبْدِ اللَّهِ الأَنْصَارِيُّ قَالَ حَدَّثَنِي أَبِي عَنْ ثُمَامَةَ عَنْ أَنَسٍ

أَنَّ أَبَا بَكْرٍ ؓ لَمَّا اسْتُخْلِفَ كَتَبَ لَهُ وَكَانَ نَقْشُ الْخَاتَمِ ثَلاَثَةَ أَسْطُرٍ مُحَمَّدٌ سَطْرٌ وَرَسُولُ سَطْرٌ وَاللَّهِ سَطْرٌ  

ذِكْرُ السَّبَبِ الَّذِي مِنْ أَجْلِهِ كَانَ يَضَعُ ﷺ خَاتَمَهُ عِنْدَ دُخُولِهِ الْخَلَاءَ

ibnhibban:1414Muḥammad b. Aḥmad b. Abū ʿAwn > Aḥmad b. al-Ḥasan al-Tirmidhī > Muḥammad b. ʿAbdullāh al-Anṣārī from my father > Thumāmah > Anas b. Mālik

"The inscription on the ring of the Prophet ﷺ was in three lines: 'Muhammad' on a line, 'Messenger' on a line, and 'Allah' on a line." (Using translation from Tirmidhī 1747)   

ابن حبّان:١٤١٤أَخْبَرَنَا مُحَمَّدُ بْنُ أَحْمَدَ بْنِ أَبِي عَوْنٍ قَالَ حَدَّثَنَا أَحْمَدُ بْنُ الْحَسَنِ التِّرْمِذِيُّ قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ الْأَنْصَارِيُّ قَالَ حَدَّثَنَا أَبِي عَنْ ثُمَامَةَ عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ

«كَانَ نَقْشُ خَاتَمِ النَّبِيِّ ﷺ ثَلَاثَةَ أَسْطُرٍ مُحَمَّدٌ سَطْرٌ وَرَسُولُ سَطْرٌ وَاللَّهِ سَطْرٌ»  

ذِكْرُ وَصْفِ نَقْشِ مَا وَصَفْنَا فِي خَاتَمِ الْمُصْطَفَى ﷺ

ibnhibban:6393Abū Khalīfah from my father > ʿArʿarah b. al-Birind > ʿAzrah b. Thābit > Thumāmah > Anas

"The inscription on the ring of the Prophet ﷺ was in three lines: 'Muhammad' on a line, 'Messenger' on a line, and 'Allah' on a line." (Using translation from Tirmidhī 1747)   

ابن حبّان:٦٣٩٣أَخْبَرَنَا أَبُو خَلِيفَةَ قَالَ حَدَّثَنَا أَبِي قَالَ حَدَّثَنَا عَرْعَرَةُ بْنُ الْبِرِنْدِ قَالَ حَدَّثَنَا عَزْرَةُ بْنُ ثَابِتٍ عَنْ ثُمَامَةَ عَنْ أَنَسٍ قَالَ

كَانَ «نَقْشُ خَاتَمِ النَّبِيِّ ﷺ ثَلَاثَةَ أَسْطُرٍ مُحَمَّدٌ سَطْرٌ وَرَسُولٌ سَطْرٌ وَاللَّهُ سَطْرٌ»  

ذِكْرُ مَا كَانَ نَقْشُ خَاتَمِ رَسُولِ اللَّهِ ﷺ

ibnhibban:5496Abū Khalīfah from my father > ʿArʿarah b. al-Birind > ʿAzrah b. Thābit > Thumāmah > Anas b. Mālik

"The inscription on the ring of the Prophet ﷺ was in three lines: 'Muhammad' on a line, 'Messenger' on a line, and 'Allah' on a line." (Using translation from Tirmidhī 1747)   

ابن حبّان:٥٤٩٦أَخْبَرَنَا أَبُو خَلِيفَةَ قَالَ حَدَّثَنَا أَبِي قَالَ حَدَّثَنَا عَرْعَرَةُ بْنُ الْبِرِنْدِ قَالَ حَدَّثَنَا عَزْرَةُ بْنُ ثَابِتٍ عَنْ ثُمَامَةَ عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ

«كَانَ نَقْشُ خَاتَمِ النَّبِيِّ ﷺ ثَلَاثَةَ أَسْطُرٍ مُحَمَّدٌ سَطْرٌ وَرَسُولٌ سَطْرٌ وَاللَّهُ سَطْرٌ»