After assuming office as the Caliph, the first case that Uthman was to try was the case of Ubaidullah. Apart from Abdur Rahman b Abu Bakr no other person supported the theory of any conspiracy. Adequate evidence was thus not forthcoming to support the theory of the involvement of Jafina and Hurmuzan in the alleged conspiracy. Again, even if it was established that these persons had entered into a conspiracy, there was no justification for the killing of the wife and daughter of Firoz. Even if there were strong prima facie grounds for holding that the assassination was the result of a conspiracy, the State alone could have tried the accused and condemned them only when they had offered their defense, and the case was established against them. Ubaidullah had no right or justification to take the law in his own hand and murder four persons without affording them an opportunity for defense. That was the Arab practice of the days of ignorance which was in violation of the injunctions of Islam.