If you have ever read 2 Samuel or the book of Joshua, you have stumbled across a literary ghost. In Joshua 10:13 and 2 Samuel 1:18, the Bible makes a curious reference to a text called Sefer HaYashar —Hebrew for “Book of the Upright” or “Book of the Just.”
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This book adds massive detail to the Genesis narrative. You will read about Abraham hiding in a cave for ten years, how he reasoned with his father Terah, and how Nimrod tried to burn him alive—a legend that later appears in the Quran.
It expands on Genesis 14, turning the story of Abraham rescuing Lot into a full-blown military epic with troop numbers and tactics.
The Book of Jasher is not the long-lost companion to Genesis that some claim. It is a medieval adventure novel dressed up as ancient history. But it is a beautiful novel.
Yes. Frequently.
For example, in Genesis, Abraham is 75 when he leaves Haran. In Jasher, he is 50. In Genesis, Moses strikes the rock at Meribah because of the people’s rebellion. In Jasher, the rock itself cries out.