xviii. 6-8), and unjust to the narrative in 2 Kings xxii., xxiii.,
to suppose that the book was written by those who pretended to find
it. It was really lost; had it been written during the earlier part
of Josiah's reign, there was nothing to hinder its being published
at once. In all probability, then, the book was in the main written
and lost during the reign of Manasseh (_circa_ 660 B.C.). It
has been observed that in some sections the 2nd pers. sing, is used.
in others the pl., and that the tone of the plural passages is more
aggressive than that of the singular; the contrast, e.g., between
xii. 29-31 (thou) and xii. 1-12 (you) is unmistakable. We might,
then, limit the conclusion reached above by saying that the passages
in which a milder tone prevails probably came from Hezekiah's reign,
and the more aggressive sections from Manasseh's.

This date agrees with conclusions reached on other grounds
concerning other parts of the Pentateuch. The prophetic narratives J
and E were written in or before the eighth century B.C., the
priestly code (P) is, broadly speaking, post-exilic.[1] Now if it
can be proved that Deuteronomy knows JE and does not know P, the
natural inference would be that it falls between the eighth and the
sixth or fifth century. But this can easily be proved, for both in
its narrative and legislative parts, Deuteronomy rests on JE. As an
illustration of the former, cf. Deuteronomy xi. 6, where only Dathan
and Abiram are the rebels, not Korah as in P (cf. Num. xvi, 12, 25);
as an illustration of the latter, cf. the law of slavery in Exodus
xxi. 2ff. with that in Deuteronomy xv. 12-18, which clearly rests
upon the older law, but deliberately gives a humaner turn to it,
extending its privileges, e.g., to the female slave.
[Footnote 1: See below.]