Hazrat Abu Wa’il narrates that Hazrat Khalid bin Walid (may Allah be pleased with him) wrote in a letter: In the name of Allah, the Most Gracious, the Most Merciful: From Khalid bin Walid to Rustam, Mehran, and the chiefs of Persia. Peace be upon those who follow guidance. I praise before you Allah, besides whom there is no deity. After praise and blessings! I invite you to Islam. If you accept Islam, you will receive everything that is for the people of Islam, and upon you will be everything that is obligatory upon Muslims. If you refuse to accept Islam, then I invite you to pay Jizya; if you begin to pay Jizya, you will receive everything that is given to those who pay Jizya, and upon you will be everything that is obligatory upon those who pay Jizya. And if you refuse, then I have with me such men who love fighting as much as the people of Persia love wine.