The Documentary Hypothesis claims that the Torah is a compilation of many manuscripts with several authors. In this Q&A from a lecture, Rabbi Fohrman explores how the Torah’s structure—its chiasms and intertextual parallels—demonstrates its singular authorship.
For more on this, take a look at A Tale of Two Names: Elokim and YHVH, a dynamic audio lectures series with Rabbi Fohrman that delves into Genesis 1 and Genesis 2 and demonstrates how these two texts are proof of how the Torah is a unified book with one author - God.