Book Of Jasher
From BiblePortal Wikipedia
Morrish Bible Dictionary [1]
A book only referred to in Joshua 10:13; 2 Samuel 1:18 , and of which nothing further is known. The quotations are poetical. There are several writings extant bearing the above title, but neither of them have any connection with the one alluded to in scripture.
International Standard Bible Encyclopedia [2]
jā´shẽr , jash´ẽr : the King James Version for Jashar (which see), and see Beth-Horon , Battle Of .
The Nuttall Encyclopedia [3]
A Hebrew book twice quoted in the Old Testament, no longer extant; believed to have been a collection of national ballads.