Book of Jasher Referred to in Joshua and Second Samuel.

Virtually ignored since it was discovered, the Book of Jasher holds vital clues to interpreting and understanding Biblical chronology, from the Flood to the Exodus. A mistake made by Archbishop James Ussher, who was unfamiliar with the book of Jasher, led to a 60-year error in placing the birth of Abraham. But this error is corrected in the chronological keys provided by the book of Jasher. And with these keys, an intriguing, and astounding story emerges.
The book of Jasher, mentioned in the Biblical books of Joshua and Second Chronicles, was faithfully translated into English from the Rabbinical Hebrew in approximately A.D. 1840. Says the translator's preface, "the ever memorable events and transactions recorded in Scripture are with many others of the most interesting nature, comprehended in the Book of Jasher; and they are all arrayed in that style of simple, unadorned majesty and precision, which so particularly distinguishes the genius of the Hebrew language/ and this, together with other numerous internal evidences, it is presumed will go far to convince the Hebrew scholar that the book is, with the exception of some doubtful parts, a venerable monument of antiquity; and that, notwithstanding some few additions may have been made to it in comparatively modern times, it still retains sufficient to prove it a copy of the book referred to in Joshua, chapter x, and 2 Samuel, chap. i.