For There Will Be Those Who Will Assuredly Make Observations Of The Moon
30 And all the yamim of the commandment will be fifty two weeks of yamim and (these will make) the entire year complete. Thus it is engraved and ordained on the heavenly tablets.
31 And there is no neglecting (this commandment) for a single year from year to year [no year can have 13 months or more than 52 weeks].
32 And command the children of Yisrael that they observe the years according to this reckoning – three hundred and sixty-four yamim and (these) will constitute a complete year and they will not disturb its time from its yamim and from its feasts; for everything will take place in them according to their testimony and they will not leave out any yom nor disturb any feasts.
33 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 will be dislodged] and they will neglect their ordinances.
34 And all the children of Yisrael will forget and will not find the path of the years, and will forget the new months and seasons and the Shabbats and they will go wrong as to all the order of the years.
35 For I know and from now on will I declare it unto you, and it is not of my own devising; for the book is written before me, and on the heavenly tablets the division of yamim is ordained, lest they forget the feasts of the covenant-brit and walk according to the feasts of the goyim after their error and after their ignorance.
36 For there will be those who will assuredly make observations of the moon – how it disturbs the seasons and comes in from year to year ten yamim too soon.
37 For this reason the years will come upon them when they will disturb (the order) and make an abominable (yom) the yom of testimony and an unclean yom a feast yom and they will confound all the yamim, the kadosh with the unclean and the unclean yom with the kadosh; for they will go wrong as to the months and Shabbats and feasts and Jubilees.
38 For this reason I command and testify to you that you may testify to them; for after your death your children will disturb them, so that they will not make the year three hundred and sixty-four yamim only and for this reason they will go wrong as to the new months and seasons and Shabbats and feasts and they will eat all kinds of blood with all kinds of flesh.
Jubilees (Yovleem) 6:30-38 RSTNE 7th Edition
Foot Notes: Any calendar that is biblical MUST have 52 weeks, not 56 or 48. 52 weeks EVERY YEAR is a sign of the true calendar.  Yes and this is why calendar confusion has set in. We have ignored the warnings.
Glossary of Hebrew Words
Yamim (H) Days
Goy, or Goyim (H)Nation (As Applied To Either Yisrael, Or The Gentiles Depending On Context). Also An Individual Not Born In Yisrael.
Yom (H ) Day, A Day
Kadosh (H) Set-Apart
Restoration Scriptures True Name 7th Edition