The law code of Hammurabi is available to us and there's a preface to it in which he basically explains why you should obey the rules that he now is laying down for you.

《汉谟拉比法典》仍现存于世，在法典的前言里，法典作者实际上解释了为什么他将在后文中列出的法条应该被人们遵守。