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.
In the Deuteronomist the Passover sacrifice can be from either flock or herd, whereas in the Holiness Code only lamb is mentioned, and in the Priestly Code either kid or lamb.
In the Deuteronomist the lamb is to be sodden or boiled, whereas in the Priestly Code this is expressly forbidden.
This is the name preferred by the Elohistic writer (E) whose work is interwoven into the Old Testament narrative, and he is followed by the Deuteronomist school (D).
But it appears certain that the decalogue as it lay before the Deuteronomist did not contain any allusion to the creation (see Decalogue), and it is generally believed that this reference was added by the same post-exilic hand that wrote Gen.