Hazrat Aamir narrates that Hazrat Khalid bin Waleed was in Hira. He wrote a letter from there to the chiefs of Persia. He gave that letter to Banu Baqeelah, and I read it in their presence. In that letter it was written: In the name of Allah, the Most Gracious, the Most Merciful: From Khalid bin Waleed to the chiefs of Persia. Peace be upon those who follow guidance. I praise Allah, besides whom there is no deity. All praise is for Allah who has scattered your powers, separated your hearts, weakened your strength, and taken away your wealth. When this letter of mine reaches you, send the jizya to me, and accept living with us as dhimmis. If you do not do so, then by Allah, besides whom there is no deity, I will send to you a people who love death as you love life. And peace be upon those who follow guidance.