Rolf Rendtorff subjects, but was notable chiefly for his 1977 book, "Das überlieferungsgeschichtliche Problem des Pentateuch" ("The Problem of the Transmission of the Pentateuch"). The book was a study of the question of Pentateuchal origins (the question of how the first five books of the bible – Genesis, Exodus, Leviticus, Book of Numbers and Deuteronomy – came to be written), and appeared at the same time as two other important books, John Van Seters' "Abraham in History and Tradition" (1975), and Hans Heinrich Schmid's "Der sogenannte Jahwist" ("The So-called Yahwist") (1976). The three studies, appearing almost together, inaugurated a heated discussion in
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