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The Ramban's Introduction to Bereishit: Who Wrote the Torah? (Part 1)
At Har Sinai Hashem tells Moshe: ואתנה לך את לוחות האבן והתורה והמצוה. The "Torah" refers to the episodes in Sefer Bereshit. Moshe does not write the Torah as a firsthand account.
Why does Moshe write Bereshit as a bystander and not with the preface וידבר ה' אל משה לאמר?
Shiur provided courtesy of Torah Anytime