In the Yahwist and Deuteronomist a solemn assembly is to be held on the seventh day, but in the Holiness Code and in the secondary sources of the Priestly Code both the first and the seventh day of the Feast of Unleavened Bread are to be solemn assemblies.
A still more vital contrast occurs concerning the place of sacrificing the Passover; as enjoined in Deuteronomy this is to be by the males of the family at Jerusalem, whereas both in the presumably earlier Yahwist and in the later Priestly Code the whole household joins in the festival which can be celebrated wherever the Israelites are settled.
No competent scholars now question the existence, hardly any one the relative dates, of J, E, and P. In Numbers one can tell almost at a glance which parts belong to P, the Priestly Code, and which to JE, the narrative resulting from the combination of the Judaic work of the Yahwist with the Ephraimitic work of the Elohist.
That the older sources (which often prove to be composite) are actually identical with the Yahwist or Judaean (J) and the Elohist or Ephraimite (E) narratives (on which see Genesis) is not improbable, though, especially as regards the former, still very uncertain.
This usage is characteristic of the writer called the Yahwist (J); see e.g.