Also known as the “Book of the Upright One” in the Greek Septuagint and the “Book of the Just Ones” in the Latin Vulgate, the Book of Jasher was probably a collection or compilation of ancient Hebrew songs and poems praising the heroes of Israel and their exploits in battle. The Book of Jasher is mentioned in Joshua 10:12-13 when the Lord stopped the sun in the middle of the day during the battle of Beth Horon. It is also mentioned in 2 Samuel 1:18-27 as containing the Song or Lament of the Bow, that mournful funeral song that David composed at the time of the death of Saul and Jonathan.

The question is if the Book of Jasher is mentioned in the Bible, why was it left out of the canon of Scripture? We know that God directed the authors of the Scriptures to use passages from many and various extra-biblical sources in composing His Word. The passage recorded in Joshua 10:13 is a good example. In recording this battle, Joshua included passages from the Book of Jasher not because it was his only source of what occurred; rather, he was stating, in effect, “If you don’t believe what I’m saying, then go read it in the Book of Jasher. Even that book has a record of this event.”