Abu Wa’il told that Khalid b. al-Walid wrote to the people of Persia:
In the name of God, the Compassionate, the Merciful. From Khalid b. al-Walid to Rustum and Mih'an among the nobles of Persia. Peace be to those who follow the guidance. To proceed: We summon you to Islam, but if you refuse then pay the jizya in subjection feeling humbled (Cf. Al-Qur'an, 9:29). If you refuse to do that, I have with me people who love being killed in God’s path as the Persians love wine. Peace be to those who follow the guidance.
It is transmitted in Sharh as-sunna.