However, Jacob Neusner argues that the Mishnah does far more than expound upon and organize the Biblical commandments. Rather, important topics covered by the Mishnah "rest on no scriptural foundations whatsoever," such as portions of the civil law tractates of Bava Kamma , Bava Metzia and Bava Batra .  In other words, "To perfect the [Written] Torah, the Oral tradition had to provide for a variety of transactions left without any law at all in Scripture."  Just as portions of the Torah reflect (according to the documentary hypothesis ) the agenda of the Levite priesthood in centralizing worship in the Temple in Jerusalem and legitimizing their exclusive authority over the sacrificial cult, so too can the Mishnah be seen as reflecting the unique "program" of the Tannaim and their successors to develop an egalitarian form of Judaism with an emphasis on social justice and an applicability throughout the Jewish diaspora.   As a result, the Talmud often finds the rabbis combing scripture for textual support to justify existing religious practice, rather than deriving the practice organically from the language of scripture.