1 Enoch 71:17
15 And he said unto me: 'He proclaims unto thee peace in the name of the world to come; For from hence has proceeded peace since the creation of the world, And so shall it be unto thee for ever and for ever and ever. 16 And all shall walk in his ways since righteousness never forsaketh him: With him will be their dwelling-places, and with him their heritage, And they shall not be separated from him for ever and ever and ever. 17 And so there shall be length of days with that Son of Man, And the righteous shall have peace and an upright way In the name of the Lord of Spirits for ever and ever.'
17 And he was the first among men that are born on earth who learnt writing and knowledge and wisdom and who wrote down the signs of heaven according to the order of their months in a book, that men might know the seasons of the years according to the order of their separate months. 18 And he was the first to write a testimony and he testified to the sons of men among the generations of the earth, and recounted the weeks of the jubilees, and made known to them the days of the years, and set in order the months and recounted the Sabbaths of the years as we made (them), known to him. 19 And what was and what will be he saw in a vision of his sleep, as it will happen to the children of men throughout their generations until the day of judgment; he saw and understood everything, and wrote his testimony, and placed the testimony on earth for all the children of men and for their generations.
Notes and References
"... He was the first to write a testimony (apparently, a warning) in which he testifed to [better: warned] mankind in [better: throughout] the generations of the earth: The weeks of the jubilees he related, presumably, how the passage of time is reckoned through these 49-year periods and their seven-year sub-units, and he made known the days of the years, that is, how many days there are in a solar and lunar year: see 1 Enoch 72-74 ..."
Kugel, James L. A Walk through Jubilees: Studies in the Book of Jubilees and the World of Its Creation (p. 48) Brill, 2012