I've been reading the book of Jasher (supposedly the one quoted in the book of Samuel) and its quite amazing.
But I ask - what is the proof or lack of proof on it's authenticity?
There are however a few seemingly sensationalized accounts, like a wolf talks to Jacob, sons of Jacob leaping up walls, strange humanoid creatures stealing donkeys, Joseph's mother speaking from the grave, and so forth. Unless I misread, it even states that it took a year to bring bricks to the top of the tower of Babel, which leads me to believe they must have had space-suits in those days :D.
Although I greatly appreciated the back-story of Nimrod vs Abraham, I found the passing-through-the-fire account (as well as the attempted infanticide) to be mirrors of other accounts in the scriptures. While repeats of events are known to happen, this seemed derived to a degree.
There is also the seeming God-evolution of Enoch, the "skins" of Adam and Eve which gave Nimrod power (which did not seem to have a symbolic purpose other than a super-hero story).
I also found it interesting that Esau killed Nimrod during a hunting expedition fulfilling a prophecy voiced in Jasher, but the bible simply states that Esau came back hungry from routine hunting.
Of course stories such as Jonah and the fish leave much to faith, which one could take Jasher on, but I was curious what proofs might exist for or against the book of modern day.