The Book of Jasher or 'Book of the Just Man (Hebrew sēfer ha yāšār ספר הישר) is a unknown book mentioned in the Hebrew Bible. The translation "Book of the Just Man" is the traditional Greek and Latin translation, while the rendering a personal name "Jasher" is found in the King James Bible, 1611.

This book is to be distinguished from the 16th Century Italian Hebrew language

Hebrew language

Hebrew is a Semitic language of the Afroasiatic language family. Culturally, is it considered by Jews and other religious groups as the language of the Jewish people, though other Jewish languages had originated among diaspora Jews, and the Hebrew language is also used by non-Jewish groups, such...

 text Sefer haYashar (midrash)

Sefer haYashar (midrash)

The Sefer haYashar is a Hebrew midrash also known as the Toledot Adam and Dibre ha-Yamim be-'Aruk. It is known in English translation mostly as The Book of Jasher...

or Toledot Adam (Venice 1552, 1625), and also from Jacob Ilive's forged Pseudo-Jasher

Book of Jasher (Pseudo-Jasher)

The Book of Jasher, or Pseudo-Jasher, is an 18th-century literary forgery by Jacob Ilive. It purports to be an English translation by Flaccus Albinus Alcuinus of a lost Book of Jasher...

 (London 1751), written in pseudo-Elizabethan English

Elizabethan era

The Elizabethan era was the epoch in English history of Queen Elizabeth I's reign . Historians often depict it as the golden age in English history...

.

Biblical references

The book appears to date from after the reign of David.
2 Samuel

Books of Samuel

The Books of Samuel in the Jewish bible are part of the Former Prophets, , a theological history of the Israelites affirming and explaining the Torah under the guidance of the prophets.Samuel begins by telling how the prophet Samuel is chosen by...

 1:18 states:

To teach the Sons of Judah

Tribe of Judah

According to the Hebrew Bible, the Tribe of Judah was one of the Tribes of Israel.Following the completion of the conquest of Canaan by the Israelite tribes after about 1200 BCE, Joshua allocated the land among the twelve tribes....

 the use of the bow; behold it is written in the Book of the Upright (Sēper haiYāšār). /David

David

David was the second king of the united Kingdom of Israel according to the Hebrew Bible and, according to the Gospels of Matthew and Luke, an ancestor of Jesus Christ through both Saint Joseph and Mary...

's lament for Jonathan

David and Jonathan

David and Jonathan were heroic figures of the Kingdom of Israel, whose covenant was recorded favourably in the books of Samuel. Jonathan was the son of Saul, king of Israel, of the tribe of Benjamin, and David was the son of Jesse of Bethlehem and Jonathan's presumed rival for the crown...

 immediately follows./

The Joshua

Book of Joshua

The Book of Joshua is the sixth book in the Hebrew Bible and of the Old Testament. Its 24 chapters tell of the entry of the Israelites into Canaan, their conquest and division of the land under the leadership of Joshua, and of serving God in the land....

 10:13 states:

And the Sun stood still, and the Moon stayed,

until the people had avenged themselves on their enemies.

Is this not written in the Book of the Upright (Sēper haiYāšār)?

The presence of this event in a book of poetry has been interpreted as a poetic description of the prolonged battle.

The Septuagint translation renders sefer hayashar in both cases as 'Book of the Just'. The reference to the bow is here missing so that the text reads:

And he gave orders to teach it the sons of Iouda: behold it is written in the Book of the Just.