Jubilees 50:4

Wherefore I have ordained for thee the year-weeks and the years and the jubilees: there are forty-nine jubilees from the days of Adam until this day, [2410 A.M.] and one week and two years: and there are yet forty years to come (lit. 'distant') for learning the [2450 A.M.] commandments of the Lord, until they pass over into the land of Canaan, crossing the Jordan to the west.