The Book of Jihad and Expeditions
32/27. Chapter:
The Prophet (saws) wrote to the Kings of the Kuffar, inviting them to Islam
Sahih Muslim
وَحَدَّثَنِيهِ نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ، أَخْبَرَنِي أَبِي، حَدَّثَنِي خَالِدُ بْنُ قَيْسٍ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، وَلَمْ يَذْكُرْ وَلَيْسَ بِالنَّجَاشِيِّ الَّذِي صَلَّى عَلَيْهِ النَّبِيُّ صلى الله عليه وسلم .
It has been narrated on the authority of the same narrator through another chain of transmitters with the same difference in the wording.
Reference : Sahih Muslim 1774cIn-book reference : Book 32, Hadith 93USC-MSA web (English) reference : Book 19, Hadith 4384