From the book of Jubilees

Chapter 6

But if they do neglect and do
not observe them according to His commandment, then they will disturb all their seasons and the years will
be dislodged from this (order), [and they will disturb the seasons and the years
34 will be dislodged] and they will neglect their ordinances. And all the children of Israel will forget and will
not find the path of the years, and will forget the new moons, and seasons, and sabbaths
35 and they will go wrong as to all the order of the years. For I know and from henceforth will I declare it
unto thee, and it is not of my own devising; for the book (lies) written before me, and on the heavenly tablets
the division of days is ordained, lest they forget the feasts of the covenant
36 and walk according to the feasts of the Gentiles after their error and after their ignorance. For there will be
those who will assuredly make observations of the moon -how (it) disturbs the
37 seasons and comes in from year to year ten days too soon. For this reason the years will come upon them
when they will disturb (the order), and make an abominable (day) the day of testimony, and an unclean day a
feast day, and they will confound all the days, the holy with the unclean, and the unclean day with the holy;
for they will go wrong as to the months and sabbaths and feasts and
38 jubilees. For this reason I command and testify to thee that thou mayst testify to them; for after thy death
thy children will disturb (them), so that they will not make the year three hundred and sixty-four days only,
and for this reason they will go wrong as to the new moons and seasons and sabbaths and festivals, and they
will eat all kinds of blood with all kinds of flesh.