Book of the Wars of the Lord

The Book of the Wars of the LORD is one of the non-canonical books referenced in the Bible that have been lost. It is mentioned in Numbers 21:13–14, which reads:
David Rosenberg suggests in The Book of David that it was written circa 1100 BC. Theologian Joseph Barber Lightfoot suggested it was another title for the biblical Book of Jasher.
The medieval Book of Jasher calls The Book of the Wars of the Lord a collaborative record Moses, Joshua, and the children of Israel wrote. It was likely a collection of victory songs about Israel's military conquest of Canaan.
In Exodus 17:14, God tells Moses to inscribe an Israelite military victory over the Amalekites in an unnamed book and recount it later before his successor Joshua. Some Torah scholars such as Moses ibn Ezra have suggested this book may refer to the Book of the Wars of the LORD.