Jasher The Hebrew title may be translated Sefer haYashar - "Book of the Upright" - but it is known in English translation mostly as The Book of Jasher following English tradition. The book is named after the Book of Jasher referenced In Joshua 10:13; 2 Samuel 1:18; And 2 Timothy 3:8.

Jasher is an historical text that covers the time period from Creation through Israel's journey into Canaan. - Summary by CJ Plog.