The Book of Jasher translated in 1840 (such as the copy by publisher Artisan)is the most likely candidate we have for the book mentioned in the Bible.... The Book of Jasher (1840) is a wonderful book and expands upon the stories of the pentateuch...all of the familar early bible stories are there, but told in much more detail. I found nothing in it to suggest that it was not sincere and true-- but even if it is a forgery, it won't hurt to read it since it follows the Biblical story from start to end.