B.C. 1300-1400. Written by Moses and published by Ezra.
Authorship
Genesis is credited to Moses in Praeparatio Evangelica AKA The Preparation of the Gospel by Eusebius of Caesarea, Book XII, quoting the Hebrew philosopher Aristobulus @ https://www.tertullian.org/fathers/eusebius_pe_13_book13.htm
Order
First five books of the Bible: Genesis, Exodus, Leviticus, Numbers, Deuteronomy.
These books are also compiled into the Torah.
(Origin of the Bible handout by my small group leader, February 8, 2023. Summarized from Wikipedia. Page 3.)
Organization
The Pentateuch partakes of the pattern set by other treaties and written agreements of the ancient Near East.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. The Canon of the New Testament by Milton C. Fisher. Pages 67.)
Theme
They primarily cover history. They describe the Creation, the Fall, the Flood, the Patriarchs, the exodus from Egypt, and the Law. (FaithQuest - Student Edition (DP) by Sharon Berry and Ollie Gibbs (2008))
The historical setting for the writing of the Pentateuch is the exodus of the Israelites from Egypt and their constitution as a nation under God at Sinai. There, the Redeemer made covenant with His people.
Structure
The opening books of the Hebrew Scriptures are by nature a covenant document recording the origin, intent, and requirements of this covenant relationship between Israel and God.
Studies of ancient Near Eastern covenants, especially treaty documents of the 2nd millennium B.C., have revealed striking parallels to the Mosaic corpus. The suzerainty treaties drawn up by kings of the Hittite empire have several notable similarities to the book of Deuteronomy and the Pentateuch as a whole. Israel's experience and special relationship with the Lord is unique, and the format in which the Lord confirmed that relationship fits beautifully into this familiar pattern of their contemporary society.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Literature in Bible Times by Milton C. Fisher, Page 99.)
Similarity to suzerainty treaties
Studies of ancient Near Eastern covenants, especially treaty documents of the 2nd millennium B.C., have revealed striking parallels to the Mosaic corpus. The suzerainty treaties drawn up by kings of the Hittite empire have several notable similarities to the book of Deuteronomy and the Pentateuch as a whole. Israel's experience and special relationship with the Lord is unique, and the format in which the Lord confirmed that relationship fits beautifully into this familiar pattern of their contemporary society. Althought the Bible is distinct from all human writings, it was providentially designed to be readily understood and adapted to the thought life of the people who received it. Today, we can better understand the Bible by learning the context in which it originated.
In the Sinai covenant, the sovereign God presented the terms of the covenant directly to the chosen people, establishing a take-it-or-leave-it proposition. The Lord's offer to Israel was in terms of "if you obey . . . then I will bless you."
Several specific elements in these treaties are clearly reflected in the Mosaic law.
Following a short preamble, a prologue details the occasion of the agreement, often some military victory over the region. Then the stipulations are spelled out--the basic terms (like the biblical Decalogue), followed by the ancillary laws or statues. These four elements are found in that order in Deuteronomy, a covenant renewal document (for the second generation out of Egypt),
Also found are a document clause and sanctions. These latter items include provision for ceremonies of acceptance and instructions for placing a copy in the shrine (for Israel, the Ark of the Covenant) and public reading of the laws.
The threat of curses for breaking of terms and the blessings for faithfulness are also seen in the biblical counterpart.
Applied to the Pentateuch as a whole, we can compare the opening chapters of Genesis to the preamble, the rest of Genesis and part of Exodus to the historical prologue, and Exodus 19 through Leviticus to the stipulations of a treaty.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Literature in Bible Times by Milton C. Fisher, Page 99-100.)
Similarity to other law codes
Before Bible scholars compared the Pentateuch with suzerainty treaties, the Mosaic laws were viewed in the light of older legal codes like Hammurabi's code (predates Moses by 200 years) and the Laws of Eshnunna and the Lipit-Ishtar Law Code (both Sumerian and even older).
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Literature in Bible Times by Milton C. Fisher, Page 101.)