As regards authorship, the ordinary opinion still is that Deuteronomy was written by Moses. This was the view handed over to Christianity in pre-critical ages by the Jews, and accepted as the natural one. But if the Mosaic authorship of the whole contents of the other books of the Pentateuch is now given up, much more should it be given up in the case of Deuteronomy. For Deuteronomy does not even claim to be written by Moses. It is not merely that in it Moses is often spoken of in the third person; that, if it were carried out consistently, as it is, for instance, in Cæsar's Commentaries, would be compatible with Mosaic authorship. But what we find is that the author, "whenever he speaks himself, purports to give a description in the third person of what Moses did or said,"[1] while Moses, when he speaks, always uses the first person. The book, consequently, falls naturally into two portions: the subsidiary, introductory framework of statement, in which Moses is always spoken of in the third person, together with the historical portions; and the utterances of Moses himself, which these introduce and hold together, and in which Moses always uses the first person.[2] Again, wherever the expression "beyond Jordan" is used in the portions where the author speaks for himself, it signifies the land of Moab.[3] Wherever, on the contrary, Moses is introduced speaking in the first person, "beyond Jordan" denotes the land of Israel.[4] The only exception is iii. 8, where at the beginning of a long archæological note, which cannot have originally formed part of the speech of Moses, and consequently must be a comment of the writer, or of a later editor of Deuteronomy, "beyond Jordan" signifies the land of Moab. If, consequently, the book be taken at its word, there can be no doubt that it professes to be an account of what Moses did and said on a certain day in the land of Moab, before his death, written by another person, who lived to the west of the Jordan. The author must consequently have lived after Moses' day; and he has taken pains by his use of language to distinguish himself from Moses in a most unmistakable way. It is no doubt possible, though not probable, that Moses might have written of himself in the third person in the connecting passages, and in the first person in the remainder of his book: but that he should have made the anxious distinction we have seen as to the phrase "beyond Jordan" does not seem possible.
But if our book, as we have it, is not by Moses, but is an account by another person of what Moses did and said on a certain occasion, that fact has a very important bearing upon the speeches reported as Mosaic. For the style of the whole book up to the end of the twenty-eighth chapter is, for all practical purposes, one. The parts where the author speaks, and the parts where Moses speaks, are all alike in style, and that style is in all respects different from the style of the speeches attributed to Moses in other parts of the Pentateuch. Consequently we cannot accept the speeches and laws as being in the very words of Moses. They may contain the exact ideas of Moses, but these have manifestly passed through the mind and clothed themselves in the vocabulary of the author of Deuteronomy. Even Delitzsch is quite decisive on this point.[5] In the tenth of his Pentateuch Kritische Studien, after distinguishing the Deuteronomist from Moses, he continues thus: "The addresses are freely reproduced, and he who reproduces them is the same who also contributed the historical framework and the historical details between the addresses. The same colouring, though in a less degree, may also be remarked in the repetition of the law in chapters xii.-xxvi. to which the book owes its name. All the component parts of Deuteronomy, not excepting the legal prescriptions, are woven through and through with the favourite phrases of the Deuteronomist."
Under these circumstances, the question immediately suggests itself to what degree this representation of Moses' legislation can be regarded as purely and unmixedly Mosaic. Was this legislation given in the main or entirely by Moses, and, if it was so given, may there not be mingled with what he gave inferences drawn by the author in whose style the book is written, and adaptations demanded by the exigencies of his later times? A full discussion of this point would, of course, be out of the question here, and it would, moreover, be superfluous. In Dr. Driver's article on "Deuteronomy" in Smith's Dictionary of the Bible, and in his Introduction to Hebrew Literature, detailed discussions will be found. All that is necessary here is that one or two large and salient aspects of the question should be looked at.
In the first place, it is important to know whether the author of Deuteronomy can have been a contemporary of Moses, or a younger contemporary of his contemporaries. If he were, the relation between the speeches and legislation in his book and that which Moses actually uttered would be similar to that between the speeches of Christ reported by St. John in his Gospel and the actual words of our Lord. They might, in fact, be taken to be in all respects a reliable, though not a verbal, representation of what Moses actually said or commanded. If, on the contrary, it should be proved, either from the character of the legislation itself, or from the evidence we have as to the date of the authorities whom the Deuteronomist quotes, and upon whom he relies, that he must have lived centuries later, then any such confidence would be materially weakened. Now there can be no doubt, to take the last point first, that Deuteronomy, taken as a legal code, though not wanting in laws which have been first formulated by its author, is mainly intended to be a repetition and a reinforcement of what we find in the Book of the Covenant (Exod. xx.-xxiii.). The result of Driver's careful tabulation of the subjects dealt with in the two codes is "that the laws in JE,[6] viz. Exod. xx.-xxiii. (repeated partially in xxxiv. 10-26) and the kindred section xiii. 3-16, form the foundations of the Deuteronomic legislation. This is evident as well from the numerous verbal coincidences as from the fact that nearly the whole ground covered by Exod. xx.-xxiii. is included in it; almost the only exception being the special compensations to be paid for various injuries (Exod. xxi. 18, xxii. 15), which would be less necessary in a manual intended for the people." This is also the conclusion of other scholars, and indeed is plainly demanded by the facts. It is, moreover, what may be called the Biblical hypothesis, for Moses is supposed to have been renewing the covenant made at Horeb, and repeating its conditions.
But in the present condition of our knowledge, the fact of Deuteronomy's dependence upon the Book of the Covenant brings into view unexpected consequences. It is true, certainly, that the laws of the latter code existed before they were incorporated in the text where we now find them. Consequently no verbal coincidences would give us the assurance that the Deuteronomist had before him the actual book in which these laws have come down to us. But a conclusion may be reached in another way. A comparison of the historical portions of Deuteronomy with the corresponding narrative in the previous four books of our Bible shows that for his history also the author of Deuteronomy relies upon these earlier narratives, and that he must have had portions at least of them before him in the same text as we have now. The verbal coincidences tabulated in Driver, pp. 75 f., as well as the general and exact agreement in the events recorded in Deuteronomy with those recorded in the earlier books, show that the author has not only drawn his information from the same sources as those of the earlier books, but that he must have had before him at least that section which contains the laws.
Now, as it happens, in the course of the analysis of the Pentateuch it has come to be all but universally acknowledged that Exod. xx.-xxiii. form part of a document which can be traced, dovetailed into others, from Genesis to Joshua, and perhaps beyond it. This document has been called by Wellhausen the Jehovist document, and in all critical books it is referred to as JE, as being made up of two sections, one of which uses Yahweh for the Divine name, and the other Elohim. The only generally known scholar who denies the existence of JE is Professor Green, of Princeton in America, who, rightly enough, sees that the Mosaic authorship of the Pentateuch cannot be held, if these separate component documents are acknowledged. But the separate existence and character of JE may be regarded as demonstrated, and also that it has been interwoven with another narrative, largely parallel, but which deals of preference with priestly matters, and has consequently been called the Priest codex, or P. Together these make up the first four books of the Pentateuch; and the remarkable thing is that, both as regards law and history, Deuteronomy is dependent upon JE. "Throughout the parallels just tabulated," says Driver,[7] "(as well as in the others occurring in the book), not the allusions only, but the words cited, will be found, all but uniformly, to be in JE, not in P. An important conclusion follows from this fact. Inasmuch as, in our existing Pentateuch, JE and P repeatedly cross one another, the constant absence of any reference to P can only be reasonably explained by one supposition, viz. that when Deuteronomy was composed JE and P were not yet united into a single work, and JE alone formed the basis of Deuteronomy." And this is not Driver's conclusion only. Dillmann, who argues with splendid ability against Wellhausen for the dating of P in the ninth century B.C. instead of after the Exile, and consequently considers that it was in existence before Deuteronomy, still holds that in general JE is the Deuteronomist's authority both for law and history, contenting himself with affirming that D shows undoubted acquaintance with laws, etc., known to us only in P. Clearly, therefore, Deuteronomy must have been written after JE had been made public, or at least after J and E had been written.
The question therefore arises, what is their date? An answer can be gradually approached in this way. As JE reappear as an element in the Book of Joshua,[8] and contribute to it an account of Joshua's death and burial, they cannot have been written by him, nor before his death. That is the first fixed point. Then we may proceed a step further. In various parts of JE there occur phrases which cannot all be later glosses, and which imply that the land, when the writer lived, had long ceased to be in possession of the Canaanites, if some of them do not even presuppose a time when the original inhabitants had been absorbed into Israel, as Solomon attempted to absorb them by making them slaves of the State. Such passages are Gen. xii. 6, "And the Canaanite was then in the land"; Gen. xiii. 7, "Moreover the Canaanites and the Perizzites dwelled then in the land"; Gen. xl. 15, in which Joseph says of himself, "I was stolen away out of the land of the Hebrews," a name which the country could not have acquired till some little time at least after the conquest. Further, in Numbers xxxii. 41, which belongs to J or E, probably the latter, we have an account of the rise of the name Hawwoth Jair. Now in Judges x. 3-5 we are informed that the Jair from whom the Hawwoth Jair had their name was a judge in Israel after the time of Abimelech, who made new conquests for his tribe east of the Jordan. Unless, therefore, the unlikely hypothesis be accepted that both the district bearing this name in Judges and its conqueror are other than those mentioned in Numbers, the verse brings down JE at least to the period of Abimelech, which Kautzsch in his View of the History of the Israelites, appended to his translation of the Old Testament, states as about 1120 B.C., i.e. two hundred years after the Exodus.
The next step is suggested by Gen. xxxvi. 31-39, a passage from JE in which a list of Edomite kings is given with this heading: "These are the kings that reigned in the land of Edom before there reigned any king over the children of Israel." That sentence clearly cannot have been written before kings arose in Israel; consequently JE must be later than the days of Saul, and probably than David, since the Israelite kingship appears to the author's mind here as a firmly established institution. The author of Deuteronomy must have lived and written at a still later date, and we are thus gradually brought down to the time of Solomon, or perhaps even later.