الكافي- ط الاسلامية, volume 1, page 501

7. Muhammad ibn Yahya has narrated from a number of our people the following. “I took a copy of the letter of Al-Mutawakkil to abu al-Hassan (a.s.), the third from Yahya ibn Harthama in the year two hundred forty three that read as follows. “In the name of Allah, the Beneficent, the Merciful. Thereafter, Amir al-Mu’minin acknowledges your positions, takes good care of you as a relative, deems it obligatory to observe your rights. He pays attentions towards your well fare and the well being of your family through the means with which Allah will grant well being to you and to them and establish your honor and honor to them, grant blessing and security to you and to them. He seeks thereby the pleasure of his Lord and to fulfill his obligations towards you and to them. Amir al-Mu’minin, believes that it is best to remove ‘Abdallah ibn Muhammad as commander of the army and prayer leader in al-Madina of the Messenger of Allah since you have mentioned his ignorance and his disregard of your rights. That he has not respected you properly. Also it is because of his accusing you of matters that Amir al-Mu’minin has learned is unfounded and he acquits of such charges. It is because of your sincere intentions in not leading a attempt to achieve what you consider yourself unfit for. Amir al-Mu’minin has replace him (‘Abdallah ibn Muhammad) with Muhammad ibn al-Fadl and has ordered him to honor and revere you and abide by your orders and opinions. He must seek nearness to Allah and to Amir al-Mu’minin in this way. Amir al-Mu’minin looks forwards to see you and loves to see you soon to look at you. If you would like to visit him and stay with him as long as you would like along with whoever of the members of your family and friends and servants you may do so whenever convenient for you and desirable. You may start your journey whenever you would like, stop on the way whenever and wherever you would like. If you would like, Yahya ibn Harthama, the slave of Amir al-Mu’minin and the elements of the army will escort you. They will travel as you would like them to do so. All the matters will be up to you to decide until you would arrive at Amir al-Mu’minin’s place. No one of his brothers, sons, family members and persons special to him would be deserving more kindness, respected position, more praise worthy and preferable to him than you do. He will not be more caring, compassionate and helpful to them and more happy with any of them than he will be with you. If Allah would so will. May peace be with you and the kindness and blessings of Allah. Written by Ibrahim ibn al-‘Abbass. May Allah grant blessing up on Muhammad and his family.

Translation: Muhammad Sarwar·The Arabic above is the original.