It is impossible to understand the New Testement to its fullness without understanding the Old Testement. And it is impossible to understand the Old Testement without appreciating the centrality of Torah, which is the Five Books of Moses. Jesus taught exclusively out of Torah, if not directly then via one or another book of the Tanakh (the O.T.), such as Psalms or one of the prophets, which in turn teach out of Torah. Therefore, Torah is the centre of the whole Bible. Everything has its root in Torah.