John Van Seters on the origins of the Pentateuch (the first five books of the bible:Genesis, Exodus, Leviticus, Numbers, Deuteronomy), arguing, with Martin Noth, that Deuteronomy was the original beginning of a history that extended from Deuteronomy to the end of 2 Kings. However, against Noth and others, he held that the so-called Yahwist, the oldest literary source in Genesis, Exodus and Numbers, was written in the 6th century BCE as a prologue to the older Deuteronomistic History, and that the so-called Priestly Writer of the Pentateuch was a later supplement to this history. This approach represented a revival of the "supplementary hypothesis"
Wife–sister narratives in the Book of Genesis are all related to each other in some way, according to Coats, sharing common content, structure and genre for communicating the content. In all three stories a promise for progeny is not a factor in the content and the structure rather the narratives have a focus on blessing. Hepner concludes, through Biblical exegesis and semantics, that it is plausible that the union of Abraham and Sarah was actually incestuous with Sarah being Abraham's half-sister. For example, in Genesis 20: 13, Abraham, talking to Abimelech, alludes to Leviticus laws or the Holiness code, by using the phrase "lovingkindness." The same word