Torah Purifying the Soul
זאת חקת התורה תלה הכתוב הטהרה בתורה שהוא עץ החיים ומזה בא הטהרה היפוך מעץ הדעת שע"י באה מיתה שהוא אבי אבות הטומאה וע"י התורה יכולין בנ"י להתטהר מן הטומאה והוא בחי' הנשמה שנתת בי טהורה היא
"This is the chukah (statute) of the Torah" (Bamidbar 19:2) — the verse made taharah (purity) dependent upon the Torah, which is the Eitz HaChaim (Tree of Life), and from it comes taharah, the very opposite of the Eitz HaDaas (Tree of Knowledge), through which death entered the world — death being the avi avos hatumah, the primary source of all sources of tumah (impurity). And by means of the Torah, Bnei Yisrael are able to purify themselves from tumah; this is the aspect (bechinah) of the neshamah, regarding which we say, "the neshamah that You placed within me, it is pure."
The Torah opens the laws of purification (the parah adumah) with the word "chukah," hinting that taharah itself flows from the Torah, the Eitz HaChaim, which counteracts the death and tumah introduced by the Eitz HaDaas; through Torah, Bnei Yisrael can cleanse themselves, and this is rooted in the pure neshamah that Hashem gives each person.
פי' טהורה שאינה מקבלת טומאה דכ' ויפח כו' נשמת חיים
The meaning of "pure" (tehorah) is that it is incapable of receiving tumah, for it is written, "and He breathed... a soul of life" (Bereishis 2:7).
The neshamah is called "pure" not merely because it begins clean, but because by its very nature it can never absorb tumah, since it was breathed directly from Hashem as a living breath.
והנשמה של איש ישראל הוא בחי' תורה דבר ה' ויש לכל נשמה חלק בתורה או באות או בנקודה והוא בחינת הנשמת חיים שבו ואינה מקבלת טומאה
And the neshamah of a Yid is an aspect of the Torah, "the word of Hashem," and every neshamah has a portion in the Torah — whether in a letter or in a vowel-point — and this is the aspect of the "soul of life" within him, which is incapable of receiving tumah.
Each Yid's neshamah is itself a piece of the Torah, the dvar Hashem, with a personal share in some letter or vowel of it; that share is the living, Hashem-breathed core within a person, and like the Torah it cannot become tamei.
כמ"ש חז"ל כה דברי כאש מה אש אינו מקבל טומאה אף ד"ת אין מקבלין טומאה
As Chazal expounded: "'Is not My word like fire?' (Yirmiyahu 23:29) — just as fire is incapable of receiving tumah, so too words of Torah are incapable of receiving tumah."
The teaching of Chazal proves the point: just as fire cannot contract tumah, the Torah — likened to fire — cannot either, and therefore neither can the neshamah that is bound up with Torah.
וז"ש מי יתן טהור מטמא דרשו חז"ל על טיפת ש"ז שהיא טמא ואדם נוצר ממנה והוא טהור שע"י שהנשמה באה אל הטיפה מקבל חיות ויוצא מטומאה לטהרה כן הוא לעולם העוסק בתורה זוכה לנשמה ולטהרה
And this is the meaning of "Who can produce a pure thing from an impure one?" (Iyov 14:4), which Chazal expounded as referring to the drop of seminal matter, which is tamei, and yet a person is formed from it who is tahor — for through the neshamah entering into the drop, it receives vitality and passes from tumah to taharah. So it is forever: whoever occupies himself with the Torah merits a neshamah and merits taharah.
The verse about deriving taharah from tumah is read as the formation of a person from a tamei drop: when the neshamah enters, it brings life and turns tumah into taharah — and the same happens spiritually whenever a person engages in Torah, drawing down the vitality of the neshamah and taharah.
ואמרו חז"ל אין לך אות בתורה שאין בה תחיית המתים אלא שאין אנו יודעין לדרוש:
And Chazal said: there is not a single letter in the Torah that does not contain within it techiyas hameisim (the resurrection of the dead), only that we do not know how to expound it.
Every single letter of the Torah holds the power of techiyas hameisim and renewed life, even though we lack the ability to unlock that meaning — underscoring that the Torah is pure, living energy capable of reviving and purifying.
Summary: This piece teaches that taharah is fundamentally a function of the Torah, the Eitz HaChaim, which reverses the death and tumah that entered the world through the Eitz HaDaas. The Sfas Emes identifies the neshamah as an aspect of the Torah itself — each Yid possessing a portion in some letter or vowel — and just as the Torah, likened to fire, cannot contract tumah, neither can this Hashem-breathed neshamah. He illustrates this with the formation of a tahor person from a tamei drop: the entry of the neshamah transforms tumah into taharah and vitality. The practical lesson is that one who immerses himself in Torah continually draws down this pure, living force of the neshamah and is thereby purified, for every letter of the Torah pulses with the life-giving power of techiyas hameisim itself.