Moses wrote it down, and put it where nobody could edit it

The first writer in the Bible tells us three separate times that he wrote, and the notices are unusually specific.

And Moses wrote down all the words of the LORD. Then he builds an altar, sends young men to sacrifice, takes the Book of the Covenant and reads it aloud to the people, who answer that they will do everything the LORD has said.

Written first. Read aloud second. Agreed to third. That is the order, and it is the order every covenant document in the ancient world followed.

Then again after the golden calf, when the covenant is being renewed:

Write these words — because the covenant is being made on the basis of them. Not on the basis of an experience at the mountain, which they had already had and had already broken.

And then, at the end of his life, Moses does something that tells you what he thought the writing was.

Finished. Complete. And then placed beside the ark of the covenant, in the custody of the Levites, as a witness against the people.

Not a witness for them. Against. Moses says he knows how rebellious and stiff-necked they are, and that after his death they will turn aside. The book is placed where it cannot be reached casually, in the hands of a tribe that did not own the throne, precisely so that there would always be a fixed text to measure the nation by when the nation went wrong.

That is the reason for writing, stated by the writer. Memory drifts. Leaders die. A generation arises that did not know. A document in the holiest room in the nation, in the custody of people with no political power, is proof against all three.

And it worked, eventually. Six hundred years later a high priest doing an inventory in a construction zone found it, and a king tore his robe. That day would have been impossible if Moses had settled for telling them.

And notice the public reading built into the arrangement. Every seventh year, at the Feast of Booths, the whole assembly was to be gathered — men, women, children and the foreigner — and the Law read in their hearing so they would learn to fear the LORD. A deposited text with no scheduled reading is an archive. The command supplies both.

This is the writer’s own testimony in the first books of the Bible, and it lines up exactly with what Luke, John, Peter and John of Patmos say about their own work. Every one of them writes so that something will survive them and hold the next generation to account.

The structure of Deuteronomy has been compared in detail to second-millennium suzerainty treaties — preamble, historical prologue, stipulations, blessings and curses, witnesses, and provision for deposit and periodic public reading. The command to place the book beside the ark and read it every seventh year fits that last element precisely. The comparison has been used to argue for an early date; that argument is contested and the parallels themselves are not.

Note who holds the book. Not the king, who does not yet exist, and when he does he is required to write his own copy from the Levites’ master and read it daily. Not a priest-king. The custody is separated from the throne by design.

The phrase for the finished writing is until they were complete, and it is the same kind of note found at the end of other blocks of material — the writer signaling a closed document rather than an open file.

There is an old and unavoidable question here about the last chapter of Deuteronomy, which records Moses’ death and burial. Jewish and Christian commentators have long attributed it to Joshua or a later editor, and Scripture itself does not say. The uncertainty about the closing verses is not a difficulty about the book’s own claim, which is stated in chapter 31.

Joshua carries out the arrangement in his own generation. At Ebal and Gerizim he builds an altar, writes a copy of the law of Moses on stones, and reads all the words of the law, blessings and curses, before the whole assembly including the women, children and foreigners among them. The chain from writing to reading to hearing is unbroken.

The ark itself contained the tablets; the book was placed beside it. Ancient practice deposited treaty documents in a sanctuary before the deity as witness, and the distinction between what went in and what went alongside has occupied commentators without much altering the point about custody.

Look it upH3789 כָּתַב kathab, to write · H5612 סֵפֶר sepher, book or scroll · H5707 עֵד ed, witness · H8552 תָּמַם tamam, to be finished or complete

Where this touchesExodus 24:3–8 · Exodus 34:27–28 · Deuteronomy 17:18–20 · Deuteronomy 31:9–13, 24–29 · Joshua 8:30–35 · 2 Kings 22 (Week One, Day One). Jeremiah, Luke, John, Revelation and Peter gave their own accounts in earlier weeks.