Comentario citado sobre Números 25:3

כי תבואו, “when you will come;” what follows will be applied after the land has been conquered, and distributed to the tribes who have settled there. If this were not so, what would be the meaning of such words as: “your vineyards, your fields,” unless the ownership of these fields and vineyards had already been established and each one of the people addressed knew the boundaries of their land?

According to the plain meaning of the text the meaning of this “sanctity” is that the land lie fallow, untouched by human hands for the entire seventh year. Man should not plough it, sow it, reap it, etc. This is the meaning of verses 3-4: “you shall sow the land for six years, and for six years you shall prune your vineyard and gather in its crop; but the seventh year shall be a complete rest for the land, a Sabbath for the Lord. Your field you shall not sow and your vineyard you shall not prune.” You are not even to harvest (in the regular way) what grows by itself during that year. This is the meaning of verse 5: “the aftergrowth (that which grows without ploughing and sowing) of your harvest you shall not reap and the untrimmed grapes of your vineyard you shall not pick.” The word ספיח in verse 5 is similar to the word ונספחו in Isaiah 14,1 “and they will join the house of Yaakov” (the proselytes). Similarly, the vineyard which has not been worked or hoed and not pruned is called נזיר, (like the Nazirite who does not trim his hair) as one abstains from working it a if it did not belong to you. The general principle governing the rules of conduct during the Shemittah year is that all the activities which suggest ownership of the field or vineyard in question have to be avoided. Any fruit of produce which grows on the field or vineyard during that year is ownerless, available on a “first come first served” basis. The legislation is meant to remind us that even during the years when we treat the land as ours, protected by all kinds of laws against infringement by people who do not own it, the land is really only on loan to us from G’d.

A kabbalistic approach: The words 'ושבתה הארץ שבת לה' do not refer to individual parcels of land belonging to individual farmers but refer to the earth as a whole and are an allusion to the seventh millennium following the six thousand years when our terrestrial universe functions normally. They are a reference to the 1000-year transitional period when the earth will be desolate, unfit as a habitat for living creatures (compare Rosh Hashanah 31). That millennium is one described as “eternal rest” (Tamid 7,4), a reference to the world to come after physical resurrection has occurred. According to this concept the Shemittah discussed in our verse would be a cessation of agricultural activity which is not voluntary but imposed by the conditions prevailing in the universe at that time. [This does not replace the normal meaning of the verses 3-8 which speak about what happens every seven years. It only explains the halachically unnecessary words that “the land shall observe rest for Hashem” (verse 2) — Ed.] The observance of a bird’s eye view of what will be in the future, i.e. what we may term a “miniature” shemittah is intended for us to focus on the eventual meaning of the concept. All the severe penalties connected with failure to observe the legislation of Shemittah and Yovel, especially the fact that non-observance is the cause of our losing our homeland and going into exile, is all due to the fact that this legislation is to give us an inkling of a much grander concept G’d has in mind for the existence of the physical universe and the message that an imperfect terrestrial universe is eventually to metamorphose into a perfect terrestrial universe. (Compare 26,34 on the collective penalties for non-observance and Avot 5,9 spelling out the worldwide ramifications of failure to observe the laws of sanctifying the seventh year.)