significant. In E the plagues come when _Moses_ stretches out
his hand or his rod at the command of Jehovah, ix. 22, x. 12, 21; in
P, Jehovah says to Moses, "Say unto _Aaron_, 'Stretch forth thy
hand' or 'thy rod,'" viii. 5, 16.

The story to which we have just alluded, of the revelation of the
name Jehovah, is also told in ch. iii., where it is connected with
the incident of the burning bush. Apart from the improbability of
the same document telling the same story twice, the very picturesque
setting of ch. iii, is convincing proof that we have here a section
from one of the prophetic documents, and we cannot long doubt which
it is. For while one of those documents (J), as we have seen, uses
the word Jehovah without scruple throughout the whole of Genesis,
and regards that name as known not only to Abraham, xv. 7, but even
to the antediluvians, iv. 26, the other regularly uses Elohim. This
prophetic story, then, of the revelation of the name Jehovah to
Moses, must belong to E, who deliberately avoids the name Jehovah
throughout Genesis, because he considers it unknown before the time
of Moses. This very fact, however, greatly complicates the
subsequent analysis of the prophetic documents in the Pentateuch;
because, from this point on, both are now free to use the name
Jehovah of the divine Being, and thus one of the principal clues to
the analysis practically disappears.[1] Considering the affinity of
these documents, it is therefore competent, as we have seen, to
treat them as a unity.
[Footnote 1: Naturally there are other very important and valuable
clues. e.g, the holy mount is called Sinai in J and Horeb in E.]

The proof, however, that both prophetic documents are really present
in Exodus, if not at first sight obvious or extensive, is at any