As per the holy Qur’an, exclusive earmarked for Hazrat Dawood was that he was made the ruler by Almighty Allah:
“O Dawood! Surely We have made you a ruler in the land; so judge between men with justice.” (Qur’an, 38:26)
Hazrat Dawood was the first one in history who ruled esoterically in matters of litigations and disputes. In other words, whenever disputes took place between two people, they would be taken before Hazrat Dawood (a.s.) who would solve the problem by virtue of his divine knowledge (i.e., based on his knowledge of the hidden and concealed realities).
It was not the case during the time of holy Prophet and the Imams. They would judge exoterically (apparently). But, at the time of Hazrat Mahdi’s (a.t.f.s.) reappearance, people would approach him with their disputes and claims and he would solve them very simply.
It should be known that such a judgment destroys any violation and transgression (which is witnessed today amongst majority of the people) because, everyone realizes that nobody can nullify the truth with the help of feigning and excuses. In other words, they fully realize that the judge is supposed to judge esoterically and his judgment is based on divine knowledge and Hazrat would act by this divine knowledge.
The similarity of Hazrat Mahdi’s (a.t.f.s.) government with Hazrat Dawood’s (a.s.) government lies in this that Imam (a.t.f.s.) would judge esoterically without calling for any witness or evidence.