Aharon draws chesed over din

בפסוק הקרב אליך כו' אהרן אחיך כו' לכהנו לי.

On the pasuk "Bring near to yourself... Aharon your brother... to serve Me as a kohen."

The Sefas Emes opens with Hashem's command to draw Aharon near for the kehunah, and asks what it was about Aharon that made him the chosen one.

בחר הקב"ה באהרן שהוא איש החסד כמ"ש לאיש חסידך להיות כ"ג.

Hakadosh Baruch Hu chose Aharon, who is the "ish ha'chesed" (man of kindness), as it is written "to Your pious man (l'ish chasidecha)," to be the Kohen Gadol.

Aharon was selected for the kehunah specifically because his defining trait is chesed — lovingkindness.

ואיתא אהרן שושבינא דמטרוניתא.

And it is taught: Aharon is the "shushvina d'matronisa" (the attendant/best-man of the Queen).

In the Zohar's imagery, Aharon serves as the groomsman who escorts the "Queen" — the Shechinah / Knesses Yisrael, the kallah — drawing chesed toward her.

לומר דהלכה כבית הלל.

This is to say that the halachah follows Beis Hillel.

The Sefas Emes connects Aharon's role to the dispute between Beis Shammai and Beis Hillel about how to praise a bride, indicating the ruling goes like Beis Hillel.

דאיתא בגמרא כיצד מרקדין לפני הכלה בש"א כלה כמות שהיא ובה"א כלה נאה וחסודה.

For it is taught in the Gemara: How does one dance before the kallah? Beis Shammai say: "the bride as she is"; and Beis Hillel say: "a beautiful and gracious bride (kallah na'ah va'chasudah)."

Beis Shammai say to praise the bride truthfully as she actually is, while Beis Hillel say to always call her beautiful and graceful regardless. The key word "chasudah" shares the root of chesed.

ובחתן לא פליגי.

But regarding the chasan (groom) they do not argue.

The dispute is only about how to describe the bride; about the groom, all agree.

דלכ"ע החתן חסיד ועושה חסד.

For according to all, the chasan is a "chasid" and one who does chesed.

Everyone agrees the groom is a doer of chesed — chesed is given freely from his side.

וכ"כ כחתן יכהן פאר.

And so it is written: "like a chasan who serves in glory (yechahen pe'er)" (Yeshayahu 61:10).

The pasuk links the chasan to the kehunah ("yechahen"), tying the groom's chesed to the priestly role of Aharon.

וכהן מדת החסד.

And the kohen is the trait of chesed.

The kohen, like the groom, embodies the midah of chesed — bestowing, giving, drawing down kindness.

אך וככלה תעדה כליה משמע כב"ש.

However, "and as a kallah adorns herself with her ornaments (keleha)" seems to follow Beis Shammai.

The pasuk's image of the bride adorning herself with her own ornaments suggests Beis Shammai's view — praising her "as she is," by her own intrinsic adornments.

אכן בה"א כלה נאה וחסודה פרש"י חוט של חסד משוך עלי'.

Yet according to Beis Hillel, "a beautiful and gracious bride" — Rashi explains: a thread of chesed (chut shel chesed) is drawn over her.

Beis Hillel's "chasudah" means, per Rashi, that a "thread of chesed" is drawn over the bride — an additional grace bestowed upon her from outside herself.

פי' אעפ"י שהיא בכלל מדה"ד ודאי.

This means: even though she is certainly within the category of middas ha'din (the attribute of strict justice)...

The bride — representing Knesses Yisrael — is rooted in middas ha'din, the side of judgment and accountability.

אך כל החסדים שבאים לעולם באים על ידי'.

...yet all the chasadim that come into the world come through her.

Despite being rooted in din, she is the very channel through which all kindness flows into the world.

ומצד זה היא חסודה.

And from this side she is "chasudah" (gracious).

It is precisely because chesed is drawn through her that she earns the title "chasudah," even though her own root is din.

שעלי' דייקא נמשך חוט של חסד.

For specifically upon her is the thread of chesed drawn.

The thread of chesed is drawn specifically over the one rooted in din — grace given to one who, by her own measure, would stand under strict judgment.

וזה הי' ג"כ מחלוקת קרח ואהרן.

And this was also the dispute of Korach and Aharon.

The Sefas Emes now applies this din/chesed dynamic to the famous machlokes between Korach and Aharon.

קרח אמר טלית שכולה תכלת.

Korach argued: a garment entirely of techeiles (a tallis that is all blue).

Korach's challenge was that a fully-techeiles garment should need no additional techeiles thread — symbolizing his claim that the Leviim, who are wholly holy, need no kohen above them.

כי בחי' הלוים הם מדה"ד.

For the aspect of the Leviim is middas ha'din.

The Leviim are rooted in the side of din — strictness and judgment, like the "all-blue" garment.

ואהרן שגם הוא מן הלוים אבל חוט של חסד משוך עליו.

And Aharon, who is also from the Leviim, but a thread of chesed is drawn over him.

Aharon shares the Levite root of din, yet a "chut shel chesed" is drawn over him — making him the channel of kindness despite that root, exactly like the bride who is "chasudah."

ועל ידו נמשך החסד אל המטרוניתא שהוא בחי' נשיאת כפים כמ"ש בזוה"ק פי' כה תברכו ע"ש פ' נשא.

And through him the chesed is drawn to the "matronisa" (the Queen), which is the aspect of nesias kapayim (the priestly blessing), as the Zohar HaKadosh explains on "Thus shall you bless" — see Parshas Naso.

Aharon, the groomsman of the Queen, channels chesed to her especially through Birkas Kohanim, lifting his hands to draw blessing down upon Knesses Yisrael.

ולכן בחר הקב"ה באהרן להורות כי הוא כלה נאה וחסודה.

Therefore Hakadosh Baruch Hu chose Aharon, to teach that he is "a beautiful and gracious bride."

Aharon's selection demonstrates the principle of "kallah na'ah va'chasudah" — that chesed is drawn even over what is rooted in din, making it gracious and beautiful.

וכל המחלוקת הם רק בבחי' זו.

And all the disputes are only in this aspect.

Machlokes itself belongs to the realm of din — to the "lower court" where matters are weighed, argued, and decided.

כי החתן נק' המלך שלמה שהשלום שלו.

For the chasan is called "King Shlomo," to whom the peace (shalom) belongs.

The groom represents the King "to whom shalom belongs" (a play on "Shlomo"/"shalom") — Hashem Himself, the source of pure chesed and peace, where there is no dispute.

ושם אין מחלוקת.

And there (with the chasan) there is no dispute.

On the side of the chasan — pure chesed and shalom — there is no machlokes at all; everyone agrees the groom does chesed.

רק בפמליא של מטה אלו אוסרין ואלו מתירין.

Only in the "lower household" (pamalya shel matah) do these forbid and those permit.

Disagreement exists only in the lower realm of din — where halachic argument plays out, some forbidding and some permitting.

מחייבין ומזכין.

...obligating and exempting (declaring guilty and innocent).

This is the world of judgment, with its verdicts of liable and clear — the domain of din where machlokes lives.

ולכן בשבת דזכור ושמור בדיבור אחד נאמרו.

Therefore on Shabbos, where "Zachor" and "Shamor" were said in a single utterance...

On Shabbos, the two commands "Remember" and "Guard" — corresponding to chesed and din — were spoken by Hashem as one, in perfect unity.

נקרא שלום דבשבת הכל שלום:

...it is called "shalom," for on Shabbos all is peace.

Because din and chesed are unified on Shabbos — "Zachor" and "Shamor" as one — Shabbos is the realm of shalom, where the disputes of the lower world dissolve and everything is at peace.

Summary: Hashem chose Aharon for the kehunah because he is the ish ha'chesed — the groomsman who draws kindness down to the "Queen," Knesses Yisrael. Like the bride of Beis Hillel who is "chasudah," Aharon is rooted in the din-side of the Leviim, yet a "thread of chesed" is drawn over him, making him the channel of all kindness through Birkas Kohanim. This was the very root of Korach's dispute: Korach (pure din, "all techeiles") denied the need for Aharon's added chesed. All machlokes belongs to the lower world of din, where some forbid and some permit; but on the side of the chasan — Hashem, "the King to whom shalom belongs" — there is no dispute. This is why Shabbos, where Zachor and Shamor (chesed and din) were spoken as one, is called shalom: there, all is peace.