The Prophet (may Allah bless him and grant him peace) wrote to Chosroes, Caesar, the Negus, and the kings of the surrounding lands. He used to write to his governors and he would write to his agents and tax collectors. It was in his letter to Caesar: "In the name of Allah, the Most Gracious, the Most Merciful. From Muhammad, the Messenger of Allah, to Caesar, the Great of Rome. Peace be upon those who follow the guidance. To proceed: Accept Islam and you will be safe; accept Islam and Allah will give you a double reward. But if you turn away, then upon you is the sin of the peasants (al-arisiyeen), and 'O People of the Scripture, come to a word that is equitable between us and you...' (Quran 3:64)." Al-Dahhak ibn Sufyan narrated, saying: The Messenger of Allah (may Allah bless him and grant him peace) wrote to me: "That you assign the wife of Ashyam al-Dababi a share of the blood money of her husband." The Ummah has reached a consensus on the letter of a judge to a judge. This is also because the need for its acceptance is pressing; for someone who has a right in a city other than his own city cannot approach it or demand it except through the judge's letter, so its acceptance is mandatory. Once this is established, the letter of a judge [to a judge] is accepted in financial matters and that which is intended for money, but it is not accepted in legal penalties (hudud), out of respect for the right of Allah the Almighty. Is it accepted in matters other than this? There are two views. The 'People of Opinion' (Ashab al-Ra'y) held this view. The followers of al-Shafi'i said: It is accepted in every right pertaining to a human being, such as wounds and other matters. As for whether it is accepted in legal penalties belonging to Allah the Almighty, there are two views. The full discussion of this section will be mentioned under 'Testimony upon Testimony', if Allah the Almighty wills. Letters are of two types: One of them is that he writes about what he has ruled upon, such as if he rules against a man regarding a right, and he is absent before its fulfillment, or he claims a right against an absent person and produces evidence for it, and asks the judge for a ruling against him, so he rules against him and asks him to write him a letter