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.”