In the Old Testament, Chapter 38 of the Book of Genesis tells the story of how Judah had twins by Tamar, his daughter-in-law. This account does not seem to be related at all to Joseph's story told in Chapters 37, 39-50, as if the author of Genesis committed the mistake of digression. However, from the perspective of Mikhail Bakhtin's polyphony theory, we discover a structural relationship of parallelism and polyphony between Chapter 38 and Chapters 37, and 39-50. They are compound events under one unified theme.