Jami' at-Tirmidhi
Jami` at-Tirmidhi 2716
حَدَّثَنَا يُوسُفُ بْنُ حَمَّادٍ الْبَصْرِيُّ، حَدَّثَنَا عَبْدُ الأَعْلَى، عَنْ سَعِيدٍ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَتَبَ قَبْلَ مَوْتِهِ إِلَى كِسْرَى وَإِلَى قَيْصَرَ وَإِلَى النَّجَاشِيِّ وَإِلَى كُلِّ جَبَّارٍ يَدْعُوهُمْ إِلَى اللَّهِ وَلَيْسَ بِالنَّجَاشِيِّ الَّذِي صَلَّى عَلَيْهِ النَّبِيُّ صلى الله عليه وسلم . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ .
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Anas ibn Malik reported: Before his death, Allah’s Messenger wrote to Kisra, Caesar, al-Najashi, and every ruler who wielded power, inviting them to Allah. This was not the al-Najashi for whom the Prophet had performed the funeral prayer.
Abu ‘Isa said: This is a hasan sahih gharib hadith.
Notes and open questions — unreviewed
The source distinguishes this al-Najashi from the ruler for whom the Prophet performed the funeral prayer.