Yom Kippur: total bittul and purification

איתא וכי בתשעה מתענין כו' אלא האוכל ושותה בתשיעי מעלה עליו הכתוב כו'.

It is taught: "Does one then fast on the ninth?…" Rather, one who eats and drinks on the ninth — Scripture accounts it to him [as if he had fasted on both the ninth and the tenth].

The Gemara questions why the Torah seems to locate the fast on the ninth of Tishrei. It answers that one who eats and drinks on the ninth in preparation for Yom Kippur is credited as if he fasted on both days — the eating itself becomes part of the mitzvah.

ותו למדו מכאן תוספת מחול על הקודש.

And furthermore, from here they derived the addition of the mundane onto the holy (tosefes me-chol al ha-kodesh).

This same teaching is the source for the obligation to extend the sanctity of Yom Kippur by adding ordinary time before and after it — drawing the holy day's light into the surrounding hours.

והענין הוא כי יוה"כ הוא מעין עוה"ב שאין בו אכילה ושתי'.

And the matter is that Yom Kippur is a taste of Olam Haba, in which there is no eating or drinking.

Yom Kippur is a foretaste of the World to Come — a realm where there is no eating or drinking, where the soul lives entirely from divine closeness rather than physical sustenance.

והוא באמת יום שמחה מאוד לבנ"י.

And it is, in truth, a day of very great joy for Bnei Yisrael.

Far from being a somber day, Yom Kippur is essentially a day of profound joy, for it is the day of purity and reunion with Hashem.

אך שאין יכולין להתדבק בשמחה זאת כראוי בעודנו בעוה"ז.

Only that we cannot cleave to this joy as we ought while we are yet in this world.

The difficulty is that, still bound within the limitations of Olam Hazeh, we cannot fully grasp or attach ourselves to the lofty, Olam-Haba-like joy of the day.

וצריכין להתדבק בהארת היו"כ לפניו ולאחריו בתוספות מחול על הקודש.

And we must cleave to the illumination of Yom Kippur before it and after it, through the addition of the mundane onto the holy.

Therefore we attach ourselves to the radiance of the day by extending it on both sides — adding mundane time before and after — so that some of its supernal light can be absorbed even while we remain in the physical world.

ובשמחת התשיעי יכולין להתדבק בהארת יו"כ אח"כ.

And through the joy of the ninth we are able to cleave to the illumination of Yom Kippur afterward.

The festive eating of the ninth is the vehicle: through that physical joy we prepare a vessel to cling to the spiritual illumination of Yom Kippur once it arrives.

וכמ"ש הרבינו יונה ז"ל בטעם הסעודה שאין יכולין לשמוח ביום הכפורים מקדימין השמחה ע"ש והוא כנ"ל.

And as Rabbeinu Yonah, of blessed memory, wrote regarding the reason for the meal: since we cannot rejoice [physically] on Yom Kippur itself, we advance the joy beforehand — see there — and this is as above.

Rabbeinu Yonah explains the meal of the ninth this way: because Yom Kippur itself allows no physical rejoicing, we move the simcha forward to the day before. The Sefas Emes notes this aligns with his point — the joy of the ninth becomes the vessel for the joy of the tenth.

כי יוהכ"פ הוא הביטול אליו ית' לגמרי.

For Yom Kippur is the complete bittul (self-nullification) to Him, may He be blessed.

The essence of Yom Kippur is total bittul — the complete nullification of one's own self before Hashem, surrendering the ego entirely to Him.

כמ"ש חז"ל מקוה ישראל ה' מה מקוה מטהר כך הקב"ה מטהר את ישראל.

As Chazal said: "The hope (mikveh) of Yisrael is Hashem" — just as a mikveh purifies, so the Holy One purifies Yisrael.

Chazal read "mikveh Yisrael" both as "the hope of Yisrael" and as "the mikveh of Yisrael": just as a ritual bath purifies, so Hashem Himself purifies Bnei Yisrael on this day.

ומינה מה טהרת המקוה כשנכנס כל קומה של האדם במים.

And from this [comparison we learn]: just as the purification of the mikveh requires that the entire stature of the person enter into the water —

The Sefas Emes draws out the comparison's deeper lesson. A mikveh purifies only when the whole body is fully immersed; no part may remain outside the water.

כן צריך כל האדם להתבטל אליו ית'.

— so too the entire person must nullify himself to Him, may He be blessed.

Just as immersion must be total, so the bittul of Yom Kippur must be complete: the whole person, with nothing held back, must submerge himself entirely in nullification before Hashem.

וכשזוכה האדם אחר פטירתו לזה מתטהר ע"י הקב"ה במקוה ומעין זה יש ביוה"כ כנ"ל:

And when a person merits this after his passing, he is purified by the Holy One in the mikveh; and a taste of this exists on Yom Kippur, as above.

The complete purification through total bittul is fully attained only after death, when a worthy soul is purified by Hashem in the supernal "mikveh." Yom Kippur, as a taste of Olam Haba, offers a foretaste of that very purification already in this world.

Summary: Yom Kippur is a taste of Olam Haba — a day of supreme joy and complete bittul to Hashem, who Himself purifies Bnei Yisrael like a mikveh that cleanses only when one is wholly immersed. Because we cannot fully grasp such lofty joy while in this world, we extend the day's light through tosefes (and the festive meal of the ninth), making the joy of the ninth a vessel to cleave to the illumination of the tenth.