Torah as unchanging life within the soul

במדרש איש כי יפליא שוקיו עמודי שש זו התורה דכתיב ושקוי לעצמותיך כו'.

In the Midrash: [on the verse about the nazir] "A man who shall set apart" — [it is linked to] "his legs are pillars of marble (shaish)," this refers to the Torah, as it is written, "and it shall be drink (shikui) to your bones…"

The Midrash connects the nazir's vow of separation ("yafli") to the verse in Shir HaShirim describing the Beloved's "legs as pillars of marble," which it identifies with the Torah, and further to "shikui le-atzmosecha" (Mishlei) — Torah as "drink to your bones." The Sefas Emes will unpack why Torah is compared to that which sustains the very bones.

פי' שדברי תורה חיים וקיימים לעד ואין מקבלין שינוי.

The explanation: that the words of Torah are alive and enduring forever, and do not undergo change.

Divrei Torah are eternal and unchanging — they are not subject to the decay and alteration that affect everything physical.

לכן אין עבירה מכבה תורה ואין ד"ת מקבלין טומאה ולכן נקראת תורה עץ חיים שאין בהם ירידה ומיתה ושום השתנות.

Therefore an aveirah does not extinguish Torah, and words of Torah are not susceptible to tumah (impurity), and therefore the Torah is called "Tree of Life," for in them there is no descent, no death, and no change whatsoever.

Because Torah is unchanging life, sin cannot snuff it out, and it cannot contract ritual impurity. It is the "Eitz Chaim" — beyond the descent, death, and flux that govern the created world.

דאיתא קוב"ה ואורייתא וישראל כולהו חד.

For it is taught: the Holy One, Blessed is He, the Torah, and Yisrael are all one.

The Zohar teaches the essential unity of Hashem, the Torah, and Bnei Yisrael. Because the Torah is bound up with Hashem Himself, it shares in His unchanging nature.

כמו דכתי' אני ה' לא שניתי.

As it is written, "I am Hashem, I have not changed."

Just as Hashem declares of Himself that He never changes, so too — by virtue of that unity — the Torah is changeless.

כן דברי תורה הרשומים בלבות בנ"י אין מקבלין שינוי.

So too the words of Torah inscribed in the hearts of Bnei Yisrael do not undergo change.

Once Torah is engraved in a Jew's heart, it takes on that same permanence — it becomes an unchanging part of him.

ולכן כתיב שקוי לעצמותיך כי היא מרפא לעצם.

And therefore it is written, "drink to your bones," for it is a healing to the bone.

The pasuk calls Torah "drink for your bones" because, like the bones which form the stable frame of the body, Torah is healing and strength at the deepest, most enduring level of a person.

וכמו עצמות שאין משתנים בנקל כמו בשר.

And just as bones do not change easily, like flesh [does].

Flesh decays and changes quickly, but bone is enduring and resistant to change — a fitting image for the permanence of Torah.

כן ד"ת נבלעין בעצם בנפשות בנ"י.

So too words of Torah are absorbed into the very essence of the souls of Bnei Yisrael.

Torah penetrates and is absorbed into the inmost "bone," the etzem, of a Jew's soul — becoming permanent and unchangeable within him.

וזה כח התורה ששם הקב"ה לבנ"י כמ"ש ויקם עדות כו' ותורה שם בישראל.

And this is the power of the Torah that the Holy One, Blessed is He, placed within Bnei Yisrael, as it is written, "He established a testimony… and set the Torah in Yisrael."

Hashem implanted this unchanging power of Torah within Bnei Yisrael — "He set the Torah in Yisrael," making it a fixed, enduring force in their very being.

ולכן בכח דברי תורה יכולין לתקן הכל כמ"ש והתודו כו' אשר עשו בכח הפה.

And therefore, through the power of words of Torah one can rectify everything, as it is written, "and they shall confess… that which they did" — through the power of the mouth.

Since Torah is unchanging life that cannot be extinguished by sin, the power of speech rooted in Torah — viduy (confession) — can repair even what was damaged. The spoken word, drawing on Torah's strength, has the power of tikkun.

וכמו כן הנזיר בהפלאה כשמקבל עליו נזירות לשם שמים הוא בחי' תורה שבע"פ לשם שמים כדי לתקן נפשו מיד חל עליו הקדושה כמ"ש קדוש הוא לה':

And similarly the nazir, in his "setting apart" (haflaah), when he accepts upon himself nezirus for the sake of Heaven, it is the aspect of Torah she-be'al peh (the Oral Torah) for the sake of Heaven, in order to rectify his soul — immediately the kedushah takes effect upon him, as it is written, "he is holy to Hashem."

The nazir's spoken vow, when undertaken purely li-shem Shomayim to repair himself, parallels the Oral Torah — the power of holy speech. Because such speech draws on the changeless, sanctifying force of Torah, kedushah descends on him at once: "kadosh hu la-Hashem."

Summary: Torah is "drink to your bones" — alive and eternal, unchanging like Hashem ("I have not changed") with whom Torah and Yisrael are one. Therefore sin cannot extinguish it and it cannot become impure; it is the Eitz Chaim. Just as bone endures where flesh decays, Torah is absorbed into the very etzem of a Jew's soul. This is why the power of holy speech rooted in Torah — viduy, and the nazir's vow undertaken li-shem Shomayim — can rectify the soul, with kedushah taking effect at once.