H 312 - Abdullah bin Ja’far Himyari said: Imam Hadi (a.s) wrote the following letter in his own handwriting addressed to Ali bin Umar Qazwini: “Have certitude in that through which you worship the Almighty Allah, whose inward is with me. With regard to one about whom you asked and that is Faras; may Allah curse him. Concentrate your efforts to curse and be inimical to him and put in this matter more effort than is possible. I am not saying that you worship Almighty Allah through incorrect issues and I don’t order you an incorrect belief. Thus try more to curse and to be inimical and to oppose him. Keep my companions away from him and refute his orders and dogmas and announce to the Shia on my behalf that I am indeed going to ask you about it in the court of the Almighty Allah. Thus woe be on one who is disobedient and is a denier of mastership (Wilayat). I have written this letter in my own handwriting on Tuesday eve, eve of the 9th Rabiul Awwal, 250 A.H. I have relied on Almighty Allah and am extremely thankful to Him.”