In addition to Mendenhall's input and perspective, Weinfeld argues that there are two forms of covenants to have occurred throughout the Hebrew Bible: 1.) the obligatory type & 2.) the promissory type. These translate to a “political treaty” as evidenced by the Hittite Empire, and a "royal grant" as shown through the covenants tied to Abraham and David. A treaty entails a promise to the master by the vassal and ultimately protects the rights of the master. This consequently works in a manner that promotes future loyalty of the vassal since the suzerain had previously done favors for them. A grant on the other hand pertains to an obligation from the master to his servant thus ensuring protection of the servant's rights.