What Is the Book of Jasher Mentioned in Joshua and 2 Samuel?

Question 1185.

What is the book of Jasher mentioned in Joshua and 2 Samuel, and should its brief, tantalising appearances in Scripture make us curious about a lost inspired text? The book of Jasher is referenced twice in the Old Testament, in Joshua 10:13 and 2 Samuel 1:18, as a source the biblical writers themselves cite, and that fact alone has generated centuries of curiosity, speculation, and, unfortunately, more than one fraudulent attempt to reconstruct or fabricate the text itself.

What Scripture Itself Says About It

Joshua 10:13 records the remarkable episode of the sun standing still during the battle at Gibeon, and immediately notes, “Is this not written in the Book of Jashar?” as though the reader might independently confirm the account against an already familiar source. 2 Samuel 1:18 similarly introduces David’s lament over Saul and Jonathan by noting it was taught to the people of Judah and that it, too, “is written in the Book of Jashar.” In both cases the biblical author is citing an external document, evidently a real, known collection of Israelite history, poetry, or song, as a supporting source for material also recorded independently in the inspired text itself.

What the Name Likely Meant

The Hebrew word behind “Jasher,” yashar, means upright or straight, so the title probably means something like “The Book of the Upright” or “The Book of the Just,” possibly a collection celebrating notable acts of righteousness or heroism among Israel’s leaders and warriors, cast in memorable poetic form suited to public recitation. This kind of national poetic anthology, celebrating great deeds in verse for public memory and instruction, fits naturally with the two specific citations we actually have, a battle account and a funeral lament, both are exactly the kind of material an ancient culture would preserve in this way.

The Book of Jasher: A Real but Lost Source, Not a Suppressed Scripture

This lost work was almost certainly a genuine ancient Israelite document, and its existence is not remotely embarrassing to the doctrine of Scripture’s own inspiration. Biblical authors, writing under the Spirit’s inspiration, regularly drew on existing historical and literary sources without those sources thereby becoming inspired Scripture themselves. 1 and 2 Kings repeatedly reference the annals of the kings of Israel and Judah in exactly the same way, citing them as sources without ever suggesting they carried Scripture’s own unique authority. The original document, whatever its full content actually was, has simply been lost to history, its physical text no longer surviving in any form, in precisely the same way that a great many other genuine ancient documents from the biblical period have not survived at all.

The Difference Between Losing a Source and Losing Scripture

This distinction matters enormously for confidence in the Bible’s own reliability. The doctrine of inspiration applies to the sixty-six canonical books themselves, not to every document those books happen to mention or draw upon along the way. God preserved his own inspired word, the Scripture he actually intended his people to have, while allowing many of the surrounding historical sources those inspired authors used to be lost over the intervening centuries, exactly as ordinary historical documents from any ancient culture are lost. Losing this particular source itself tells us nothing troubling about the doctrine of Scripture; it simply confirms that biblical authors, like any careful historian, drew on real, ordinary written sources available to them at the time.

Beware of the Modern Forgeries

Unfortunately, the genuine mystery surrounding this lost source has attracted more than one fraudulent attempt to supply a replacement. An eighteenth-century English forgery, and a separate nineteenth-century American publication also bearing the title, both claim to be the authentic ancient text, and both are demonstrably modern compositions with no genuine connection to the actual document Joshua and 2 Samuel reference. These later works borrow biblical names and settings while inventing extensive narrative material found nowhere in genuine ancient sources, and any reader who encounters a printed “Book of Jasher” for sale today should understand clearly that they are holding a modern literary invention, not a recovered biblical source.

How This Fits the Doctrine of a Complete Canon

I have written more broadly about how the canon of Scripture came to be recognised in How Was the Canon of Scripture Formed?, and this whole subject illustrates an important principle from that wider discussion. The existence of sources like Jasher, the annals of the kings, or other lost ancient documents mentioned in Scripture does not imply that God’s revealed word is somehow incomplete or missing pieces we urgently need to recover. Scripture itself tells us plainly what we need for faith and life, and no lost external source, however intriguing its brief scriptural mention might be, alters that settled sufficiency in the slightest.

Poetry, History, and How Ancient Israel Preserved Memory

Ancient Near Eastern cultures generally, and Israel specifically, relied heavily on poetry and song to preserve important historical memory in a largely oral, pre-print culture where written copies were rare, expensive, and difficult to produce and circulate widely. A striking military victory or the death of a beloved king would naturally be commemorated in verse, memorable, rhythmic, suited to public recitation at gatherings and festivals, and precisely this kind of material would then be collected into anthologies for ongoing communal use across the generations that followed. This entirely ordinary historical practice, common across the ancient world and well attested archaeologically in surrounding cultures, is almost certainly what lies behind both scriptural citations, rather than anything unusual or theologically loaded needing further special explanation.

What This Teaches About Biblical Inerrancy

It is worth being precise about what the doctrine of inerrancy actually claims here, since this whole subject sometimes gets muddled with questions about inspiration and sourcing. Inerrancy claims that Scripture, in its original manuscripts, is entirely truthful in everything it affirms, not that every source a biblical author happens to mention was itself equally truthful or inspired in every particular. I have set out this careful distinction more fully in What Is Biblical Inerrancy? When Joshua cites this lost anthology as confirming the sun standing still, Joshua is affirming, under inspiration, that the event happened and that this external record corroborated it from the standpoint of Israel’s own national memory, not vouching for the truthfulness of every other line the wider anthology may have once contained.

What a Believer Should Actually Do with This Curiosity

Healthy curiosity about this lost historical source is entirely appropriate and, frankly, understandable, but it should lead a careful reader toward sound historical study rather than toward modern forged texts sold under its name. If you want to engage the genuine question responsibly, read the actual biblical references themselves closely, Joshua 10:13 and 2 Samuel 1:18, note exactly what they claim and do not claim, and treat any printed edition claiming to be the recovered original with the same healthy scepticism you would bring to any other undocumented historical claim making extraordinary promises.

Comparing This to Other Lost Ancient Sources

The Old Testament references several other documents in a similar way, sources the biblical authors evidently consulted or cited without those sources themselves becoming part of the inspired canon. Numbers 21:14 mentions the Book of the Wars of the LORD, another apparently poetic or historical anthology otherwise unknown to us today, and the books of Kings repeatedly point readers toward now-lost royal annals for further detail on a given king’s reign. None of these citations troubled ancient Israel’s own confidence in the Scripture they actually possessed, and none of them should trouble ours either. Ancient historians and biblical authors alike regularly gestured toward fuller external sources their readers could, at the time, still consult, in exactly the way a modern historian might cite an archive that has since been destroyed by fire or simply lost through the ordinary passage of centuries.

Why the Modern Forgeries Fail Basic Scrutiny

The eighteenth and nineteenth-century publications claiming this title fail under even modest historical examination. Their language, style, and content reflect the concerns and literary conventions of their own recent era of composition rather than genuine ancient Hebrew literature, and neither publication can trace any credible manuscript history back beyond its own stated modern origin. Serious biblical scholars, across every theological tradition, from the most conservative to the most critical, agree in rejecting both texts as authentic ancient sources. A believer who genuinely wants sound historical grounding for their faith gains nothing from treating either forged text as though it carried real historical or spiritual weight, and risks real embarrassment when the fabrication is inevitably pointed out by a more careful reader.

So, now what?

Let the book of Jasher remind you how much genuine ancient literature has simply been lost to history without any threat whatsoever to the sixty-six books God has actually preserved for his people. Enjoy the historical mystery for what it honestly is, and steer well clear of any modern publication claiming to have recovered what history and, evidently, God’s own providence, chose not to preserve for us. Your confidence in Scripture never rested on possessing every ancient source a biblical author happened to mention in passing, and it should not begin to waver now simply because one of those sources has quietly slipped out of history’s grasp over the intervening centuries.

“Is this not written in the Book of Jashar? The sun stopped in the midst of heaven and did not hurry to set for about a whole day.” (Joshua 10:13, ESV)