Francis Watson online
As we shall see, Paul cites individual texts not in an ad hoc manner but on the basis of a radical construal of the narrative shape of the Pentateuch as a whole, highlighting and exploiting tensions between Genesis and Exodus, Leviticus and Deuteronomy. Many of the apparent contradictions within Paul’s “view of the law” in fact originate within the pentateuchal texts themselves, at least as Paul reads them. Precisely in their canonical form, these texts are not at all the homogeneous and monolithic entity they are often taken to be.
Watson is particularly interesting and cautious on method, e.g., it is "inappropriate to try to reconstruct from divergent sources a single “contemporary Jewish” reading of a particular part or aspect of scripture, which would then serve as a foil for the Pauline reading."