What is the story regarding when the Prophet Muhammad (peace be upon him) sent a letter to Khosrau and it was torn into pieces?
 Narrated Ibn `Abbas:                     Allah's Apostle sent a letter to Khosrau with `Abdullah bin Hudhafa As-Sahmi and told him to hand it over to the governor of Al-Bahrain. The governor of Al-Bahrain handed it over to Khosrau, and when he read the latter, he tore it into pieces. (The sub-narrator added, "I think that Ibn Al-Musaiyab said, 'Allah 's Apostle invoked (Allah) to tear them all totally Khosrau and his companions) into pieces.