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Sefer haYashar (Hebrew ספר הישר) means "Book of the Upright One", but Jashar is generally left untranslated into English and so Sefer haYashar is often rendered as Book of Jasher.
Rabbinical treatises
Sefer haYashar, a collection of sayings of the sages from the Amoraim period in Rabbi Zerahiah's Sefer Hayasher
Sefer haYashar, a commentary on the Pentateuch by the 12th-century Abraham ibn Ezra
Sefer haYashar, by the Kabbalist and philosopher Abraham Abulafia
Book of Jashar, fictional translation of the supposed Book of Jasher mentioned in 2 Samuel by Benjamin Rosenbaum (born 1969)
Topics referred to by the same term
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