(4) باب مَا كَانَ يَبْعَثُ النَّبِيُّ صلى الله عليه وسلم مِنَ الأُمَرَاءِ وَالرُّسُلِ وَاحِدًا بَعْدَ وَاحِدٍ
Narrated `Abdullah bin `Abbas:
Allah's Messenger (ﷺ) sent a letter to Khosrau and told his messenger to give it first to the ruler of Bahrain, and tell him to deliver it to Khosrau. When Khosrau had read it, he tore it into pieces. (Az-Zuhri said: I think Ibn Al-Musaiyab said, "Allah's Messenger (ﷺ) invoked Allah to tear them (Khosrau and his followers) into pieces."
Reference: Sahih al-Bukhari 7264
In-book reference: Book 95, Hadith 18
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 91, Hadith 369