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The hypothesis was formed from several lines of evidence suggesting that more than one author had a hand in writing the Torah.
Stage 1
The first stage was the recognition of certain passages that looked like additions from a later copyist:
Stage 2
The second stage was the discovery of "doublets", stories that appeared in two forms, with differing details that included one version using Elohim to refer to God, and the other version using YHWH. Examples include:
And then there are doublets that don't fit the YWHW/Elohim pattern, but appear reflect two distinct traditions:
Stage 3
The third stage was the development of the documentary hypothesis itself. Scholars identified what they believed to be four sources, which they labeled J, E, P, and D.