“Behar” means “on/at the Mountain [Sinai]”

Question Were the general principles and the details given at Mt. Sinai? If that is the case, then how could it be that there are commandments that we can no longer perform? If it was general principles, then it makes more sense, for these general principles could be eternal, but the details would not be.

Chapter 25

This portion is essentially about the Shemittah, the Sabbatical year, which is the year of rest, just like the Shabbat is a day of rest. Every seventh year all work on the land ceases, and its produce becomes free for all to take, man and beast.

v25:4-5] Shemittah

Specifically, you may not “sow you field, nor prune your vineyard”. Additionally, you “shall not reap the aftergrowth of your harvest”, not pick the grapes you had set aside for yourself."

Note It seems that only certain agricultural work is forbidden, that which requires “sowing the field”, which is essentially grains. It also seems that grapes are not to be pruned? As far as the produce that is available to all, it is also from the leftover grains, and the grapes - that you set aside for yourself.

So what is allowed? Could one plant grapes? One can continue to produce fruits and vegetables. In additional, besides the restricted agricultural work, all other forms of work are permitted, like doctors, or metalworkers, etc.

Essentially it is the grains and grapes (which produce wine) that are affected.

Note Once again, most of us are far from the harvesting of our own food. It is bought from a store, picked many miles away. So how many of us are able to obey such laws—certainly most farmers would not be willing to let all their fields lie fallow for a year? We are allowed to eat grains that have not been grown according to Torah law, yet are not allowed to eat meat that has not been properly prepared for the sacrifice.

Jubilee

Then seven Sabbatical years are followed by a fiftieth—the Jubilee year, when all work on the land ceases, all indentured servants are set free, and all ancestral estates in the Holy Land that have been sold, revert to their original owners. This is the year following the of the 7th shemittah. “And you shall count for yourself seven sabbatical years, seven years seven times”. [v8].

Note v25:14-16] The Jubilee creates a different economic system. It keeps land title in the family. But what about growth? If you have a number of children, etc, suddenly the land you inherited will become too small, and another property rights overlay to accommodate that expansion will occur.

Then, G-d goes into details as the purchasing of the land that will be affected by the Jubilee. However, in His detailing there is a constant reminder to not do wrong by your fellow Jew.[v25:14-17]

Note The execution of the shemittah contains a number of issues. The first is that the harvest in the sixth year must be a bumper harvest, as the people are not going to have freshly grown food for over a year. Let it be so.

It also affects the price of things, especially of land. The land value will be affected by the closeness to the shemittah.

Another issue is that it is uncertain where and when this was consistently practised. There is a possibility that it has never been implemented.

Of course, the people ask: “What are we to eat in the seventh year, if we may neither sow nor gather in our crops?” G-d responds that he will “yield a crop sufficient for three years”[v25:22]

v25:18-19]
וַעֲשִׂיתֶם֙ אֶת־חֻקֹּתַ֔י וְאֶת־מִשְׁפָּטַ֥י תִּשְׁמְר֖וּ וַעֲשִׂיתֶ֣ם אֹתָ֑ם וִֽישַׁבְתֶּ֥ם עַל־הָאָ֖רֶץ לָבֶֽטַח׃

You shall observe My laws and faithfully keep My rules, that you may live upon the land in security;

וְנָתְנָ֤ה הָאָ֙רֶץ֙ פִּרְיָ֔הּ וַאֲכַלְתֶּ֖ם לָשֹׂ֑בַע וִֽישַׁבְתֶּ֥ם לָבֶ֖טַח עָלֶֽיהָ׃

the land shall yield its fruit and you shall eat your fill, and you shall live upon it in security.

Note If we expand our concept of the Holy Land to be a way of life, rather than a purely geographic, empirical place. As well as an internal space.

Note In the light of the video you shared, about the Black Nobility, I could look at many aspects of these rites and laws and restrictions as falling into a control matrix. The one that sticks out for me, is that the houses in the walled cities were exempt from the Jubilee. Also, only the finest of the fine, the best of the best, went to the priests.

Some details:
[v25:25] “If one of your kin is in straits and has to sell part of a holding, the nearest redeemer, i.e., the closest relative able to redeem the land. shall come and redeem what that relative has sold.”

Then, additional laws overseeing the sale of lands, laws against fraud (in business) and charging interest (usury) are introduced.

Usury

[v25:37] “do not exact advance or accrued interest, i.e., interest deducted in advance, or interest added at the time of repayment. but fear your God. Let your kin live by your side as such.”

v25:38]

v25:39-55] Slaves

N: What is amazing for the time, is that there were some laws regarding the treatment of slaves.

v25:47-55] Treatment of a Jew that is sold to another Jew.

Ending with:

Chapter 26

v26:1-2] Idols & Sabbath

Note Translation of v1 is not quite accurate. Do not make for yourselves any false gods, nor raise up images or monuments for yourselves, nor set up figured stones… אֱלִילִ֗—of false gods, of naught, good for nothing, worthless