The Torah in Parashat Vaet'hanan (4:2) introduces the prohibitions known as "Bal Tosif" and "Bal Tigra" – adding onto the Torah's laws, and detracting from the Torah's laws. Rashi explains that this refers to adding onto or detracting from a particular Misva. He gives the examples of wearing Tefillin with parchment containing more or fewer Parashiyot (sections of text) than the Torah requires. There are four Parashiyot which are to be inserted in the Tefillin, and if a person adds a fifth Parasha, then he transgresses the prohibition of "Bal Tosif," and if he includes only three Parashiyot, then he violates "Bal Tigra." Another example given by Rashi is waving more than four species on Sukkot, or fewer than four.
The Ramban comments that the prohibition of "Bal Tosif" includes also introducing a new Misva to the Torah. If a person comes along and makes up a new law, claiming that this should be part of the Torah, he violates the prohibition of "Bal Tosif." Conversely, one who decides that a certain Biblical command is no longer part of the Torah transgresses "Bal Tigra."
The Ramban clarifies that this applies only to one who introduces a new law and claims that it is obligatory as a Biblical imperative. The Sages enacted numerous obligations and prohibitions, but they made it very clear that these are not included in Torah, but are rather provisions that they saw fit to legislate to meet a particular need. And, they stipulated that the laws they enacted are treated differently than the laws of the Torah, with greater leniency. Thus, they do not violate the prohibition of "Bal Tosif."
The Gaon of Vilna (1720-1797) brilliantly noted that both interpretations are correct, and rooted in the text of the Torah. The prohibition of "Bal Tosif" appears not only here, in Parashat Vaet'hanan, but also later, in Parashat Re'eh (13:1). However, the contexts of these verses reveals that they address two different commands. Here in Parashat Vaet'hanan, the command of "Bal Tosif" appears after Moshe tells the people, "Listen to the statutes and laws which I am teaching you to observe" (4:1). Moshe is telling Beneh Yisrael that he was going to present to them the Misvot, and he then warns them not to add more laws or to reject any of the laws that he was teaching them. In Parashat Re'eh, however, Moshe says, "Each thing that I am commanding you – you shall ensure to observe; do not add onto it, and do not detract from it." It seems clear that in this verse, Moshe speaks of each particular Misva, urging the people to observe every Misva precisely as he commands, without adding onto the Misva or taking anything away from it.
The Ha'ketab Ve'ha'kabbala (Rav Yaakov Tzvi Mecklenberg, 1785-1865) follows this general approach of the Vilna Gaon, but he notes a different distinction between the two verses. The command here in Parashat Vaet'hanan is formulated in the plural form – "Lo Tosifu…Ve'lo Tigre'u" – whereas the command in Parashat Re'ei appears in the singular form – "Lo Tosef…Ve'lo Tigra." The Ha'ketab Ve'ha'kabbala thus suggests that here in Parashat Vaet'hanan, the Torah is addressing not an individual, but rather the Sanhedrin, the highest rabbinic body, which represents the entire nation. These scholars, the leading Sages of Israel, are the ones who need the warning not to change the Torah by introducing new laws or doing away with existing laws. In Parashat Re'eh, by contrast, the Torah is addressing the individual, who has no authority and would thus never think to introduce a new Misva, or eliminate a Misva. He needs the warning not to add onto or detract from specific Misvot, such as by adding an additional Parasha to the Tefillin or removing a Parasha.
This command reminds us of the timelessness of the Torah, that at no point does it become "outdated" or in need of modification. Already from the outset, when the Torah was given, we are told that it and all its commands are eternal and eternally binding. Today's world is, of course, very different from the world at the time of Matan Torah, and the changing circumstances may affect the practical application of certain Misvot, based on the details of each Misva's requirements as determined by our oral halachic tradition. But never can we say that a Misva is no longer binding simply by virtue of the fact that many centuries have passed since the Torah was given. Each and every Misva is eternally relevant, and we are bound to all the Misvot no less now than our ancestors were millennia ago.
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