The Book of Jubilees, sometimes called Lesser Genesis (Leptogenesis), is an ancient Jewish religious work, considered canonical by the Ethiopian Orthodox Church as well as Beta Israel (Ethiopian Jews), where it is known as the Book of Division. Jubilees is considered one of the pseudepigrapha by Protestant, Roman Catholic, and Eastern Orthodox Churches. It is also not considered canonical within Judaism outside of Beta Israel.
The Book of Jubilees claims to present "the history of the division of the days of the Law, of the events of the years, the year-weeks, and the jubilees of the world" as revealed to Moses (in addition to the Torah or "Instruction") by angels while he was on Mount Sinai for forty days and forty nights.