What is the oldest book in the Bible?

I suppose perhaps the oldest book in the Bible is the Book of Job. At any rate, it bears the same relation to the poetical books as Genesis to the historical; so it is very early — after the flood, but before the law. And let us think how over 3,000 years ago it was written there, "Their seed is established in their sight with them, and their offspring before their eyes. Their houses are safe from fear, neither is the rod of God upon them. Their bull genders and fails not, their cow calves and casts not her calf. They send forth their little ones like a flock and their children dance. They take the timbrel and harp, and rejoice at the sound of the organ. They spend their days in wealth and in a moment go down to the grave, therefore they say unto God, Depart from us; for we desire not the knowledge of thy ways" (Job 21:8-14)!

as given by their numerical significance, is different from that found in our common Bibles, which seems based upon the age of the (supposed) authors. Job, thus, by whomsoever written, is the oldest and comes first the Psalms next, as characteristically the Psalms of David and last come the three books of Solomon — Proverbs, Ecclesiastes, and the Song. But there is no uniform arrangement of these books in the MSS, and no trace of a divine order in any of them. If the Pentateuchal analogy and the numbers do not help us, then we have no help. Thank God, they speak here plainly, and thus with the most absolute authority. Let us look at them briefly in this way.

And all this is very striking in so early a book as this of the Old Testament. For there is no reason to doubt that it is quite as early as the Book of Genesis, and very probably written by the same man. It is earlier, I do not hesitate to say, than the Book of Exodus. It may have followed Genesis or not; that I cannot say. They may have been comparatively together. It might even have been before Genesis, as far as that is concerned; but it is extremely early, and before Israel's history as a nation began. There is, in the book, no coming out of Egypt, crossing the wilderness, and going into the land — not even the slightest allusion to any of them. Had these things then taken place an allusion would have been very highly appropriate; but there is nothing of the kind.

During the course of time the following authors have been supposed: Job himself, Moses, Solomon, Isaiah, Ezekiel and Baruch. But all these suppositions are uncertain. The oldest supposition dates the book as far back as the time of Moses or even before Moses. In any case the events occurring in the book would indicate a very early time of origin. The following facts mainly suggest so:

The first thing which it is well to bear in mind is that the book was written in the earliest days of revelation. It would be hazardous to say that any book of Scripture preceded it. That the writer of the book of Job (writer I say advisedly; for God of course is the real author of all Scripture), that the one used to give us the book was a contemporary of Moses, if not Moses himself, would seem to be not far from the mark. Of course one can only give a conjecture on such a point. Scripture has not defined the author; and, in my opinion, it would not become any man to do more than express a judgment as far as the Lord gives him a moral estimate of its character, without now discussing certain other marks of a more external kind. But it is very plain that, whether Moses was the writer or a contemporary of the writer, the groundwork of the book lies in a day previous to Moses. Nor should we doubt that it is the authentic account of all, a real history of Job and his friends, which is presented in the book. We see from the book itself, for instance, that the age of Job was extended after his trial, and he was by no means a young man when the trial came; so that, unless there were some singular exception in his age of which Scripture never speaks, Job himself must have been previous to the days of Moses. Now Moses was an exception, and Scripture itself speaks of Moses living so long in his day as a remarkable feature; and indeed it follows from his own words, from his own prayer, in Psalm 90, that the age of man, as a general rule at that time, had been reduced practically to very much what it is at the present. Moses was one that stood out from his fellows in more ways than one, even of an outward nature, not to speak now of his faith; for it is plain that both he and his brother were remarkable exceptions. Job, however, must have lived somewhat before them from the way the facts are stated.

Having thus surveyed the historical parts of the O.T. with a view to the question of divine design, it remains for us to apply the same research into the poetical books, at the head of which in the English and many other Bibles stands that of Job. No sufficient ground appears for doubting that it rightly opens this fresh division of O.T. scripture. Even those free handlers of the Bible (who admit the impossibility of fixing the date of this book precisely, but would like to bring it down to Jeremiah's age) allow the weight of Ezek. 14:14-20 for the true personality of the patriarch, his known righteousness, and the proved value of his intercession. The internal evidence of the book points to patriarchal times and manners; the religious observances, and even the idolatry which was spreading, though (like adultery) an iniquity for the judge, all confirm the bearing of his age. On the other hand the prologue and the epilogue naturally imply that the writer of the book was not earlier than Moses, though recounting the great debate which supposes God not so known. Indeed not a few of weight have been impressed by the similarity of its narrative to the book of Genesis.

Chap. 1:1-12. Now I have only read the introduction, and indeed but a part of the introduction, because the first two chapters comprise the introduction. And then follows the impassioned and vehement opening speech of the patriarch Job. It is clear that here we have got a Book of patriarchal time. All the circumstances point to that time and no other; and further, it is as well to state even now before we go on, that the Book appears to have been written in the time of Moses, and probably by Moses. But some people are a little perplexed by the fact that it comes after the Book of Esther in the Bible. That has nothing whatever to do with the date of it. The Historical Books are given from Genesis to Esther — that is the end; then we begin the Poetic Books — Job, the Psalms, Proverbs, Ecclesiastes, and the Song of Solomon. Therefore it is that we necessarily go back here; because poetry was written certainly not after history, but concurrently with it; and we can easily understand that the Book of Job carries us back to the very same time that the first Book of the history goes back to. Everything concurs to show that.

What a striking witness we have in this book — one of the oldest in the world — to facts which stand out plainly in the New Testament. Here are patriarchal saints, living only a few centuries after the flood, with a knowledge of God according to the primeval revelation of Himself. Men did not develop out of heathenism into the knowledge of God, but the reverse. As Romans 1 says "When they knew God, they glorified Him not as God;" and again, "As they did not like to retain God in their knowledge, God gave them over … " However stubborn Job was in his self-righteousness, and his friends were in their thoughts, they did not exclude God from their knowledge. He was very present in their thoughts.

The scenes of this book belong in point of antiquity to the patriarchal age this we gather from the following considerations: — Job must have been nigh a century old, if not more, when the Lord opened the controversy with Satan respecting His servant. The patriarch then had seven grown-up sons, for they had houses of their own, and three daughters, while after his trial he lived a hundred and forty years (chaps. 1, 42). Does not this long age conclusively point to a time, certainly not later, if not earlier than, the days of Abram? This is further confirmed by a reference to the earliest form of idolatry, that of the heavenly bodies (Job 31:26-27), the only kind mentioned in the book, and further by the frequency of the patriarchal title "the Almighty" occurring oftener than in any other book of Scripture. Job, too, like his contemporaries prior to the days of Moses, is seen in household priestly action (Job 1:5). According to many — Jews and Christians — Moses was the writer of the book; if so, it was probably written forty years at least before the Pentateuch, the former in the land of Midian (Ex. 1), and the latter subsequently on the plains of Moab (Deut. 31:22, 26).

The longevity of Job and the priestly action as head of the family (his historic reality being attested by Ezekiel in the Old Testament and by James in the New) point to patriarchal times: after Abraham and before the Exodus would seem the limits, if indeed Moses himself did not write the book. At any rate Dr. S. Lee has given a copious list of striking coincidences with the Pentateuch. The reader will notice how "the Almighty" (the revelation of God to the fathers) appears familiarly in the speeches of Job and his friends, as well as "God" as such. Jehovah is regularly used only when the writer describes or introduces Himself as speaking. The exception is in Job 12:9, Job 28:28 being Adonai and not Jehovah, Genesis proves however that the name of Jehovah was not a secret before God gave it by Moses as a name of relation to Israel. The idolatry alluded to in Job 31 is the earliest that came in by Satan's craft, and therefore suits well the patriarchal age; but it does prove that the book must have been written after the flood, for we hear of no idolatry before it. The mention of angels as the "sons of God" tallies with the Mosaic phrase in Genesis 6, and Satan's character with the serpent of Genesis 3.

For these and similar reasons of no little weight, some of a linguistic nature, one sees how the book fits in with the days of the earliest revelation from God to man. Nothing can be conceived more opposed to the truthful simplicity of scripture than a late writer (I will not say indulging in a fiction, but) even in a true narrative affecting the archaic style and language of an age long past. Nor is it rational, to take the lowest ground, that the Jewish canon could have admitted such a book unless the prophets had accepted it as inspired no less than authentic, as it is the weightiest and earliest witness against their narrow and exclusive spirit in respect of all outside themselves. The same principle applies to Melchisedek in Genesis and to Jethro in Exodus and Numbers. The book of Job therefore stands properly at the head of the Hagiographa, or poetical books of the Old Testament. Indeed a late Hebrew commentator deserts the general belief of the Rabbins for the scepticism of Samuel Bar Nachman, and a few others, on the express ground of incredulity that the patriarchs of Israel should be so left behind in spiritual power by a Gentile like Job, not to speak of his three friends and Elihu.