It states in this week's parashah (23:10) מִי יַע ֲקֹב עֲפַר מ ָנָה, "Who has counted the dust of Yaakov." It states in the Midrash (Tana d'Bei Eliyahu, Yalkut Shimoni, and Baal HaTurim) that עֲפַר represents bachurim, young Jewish men, as it states (Shir HaShirim 8:14) הָא ַיָּלִים לְעֹפֶר, which means a young deer. The Aruch (עפר ערך) adds, quoting a midrash, that יַע ֲקֹב עֲפַר מ ָנָה מִי is telling the praises of bachurim who are young, and the yetzer hara is burning within them. Yet, they guard themselves from aveiros and they have yiras Shamayim, and they act with kedushah and taharah. מ ָנָה מִי, who can measure the greatness יַע ֲקֹב עֲפַר of the young bachurim in klal Yisrael, who control their yetzer hara.
The Gemara (Megillah 16a) tells that Haman came to lead Mordechai through the streets of Shushan with great honor, and at that time, Haman heard that the students were learning hilchos kemitzah. Haman said, "Your kemitzah (handful of flour for a korban) pushed away my ten thousand kikars of silver (that he wanted to give to Achashveirosh, to have the right to kill the Jewish nation)." The Yismach Yisrael (ישראל של מוארן Purim 1) explains that at this time, Mordechai thought that Haman would kill him; therefore, he wanted to quickly teach his students the secret and the foundation of Yiddishkeit. He taught them the halachos of kemitzah. This is when the kohen puts his hand into a utensil filled with oil, and he pulls out a kemitzah, a handful. This becomes a korban for Hashem. This tells us that what a person is קומץ, and it is concealed from others, this creates a nachas ruach for Hashem. This is a great rule in avodas Hashem. When a person is קומץ his eyes and he holds back from looking where he shouldn't, and no one knows but Hakadosh Baruch Hu, alone, or when he is פיו את קומץ, closes his mouth from speaking something he shouldn't say, and only Hashem knows how much mesirus nefesh he had and how hard he worked to overcome his yetzer hara, at this time, the kometz becomes a nachas ruach for Hashem, because he is doing Hashem's will. Therefore, Haman said, "Your handful of kometz pushed away my ten thousand silver kikars. It is because when a person overcomes the yetzer hara for something that he desires, this pushes away all kitrugim of the yetzer hara."
It states that the people of Moav said to the elders of Midyan (22:4) כָּל אֶת הַקָּהָל יְלַח ֲכוּ עַת ָּה הַשָּׂדֶה יֶרֶק אֵת ּ ׁוֹרהַש כִּ לְ חֹךְ סְבִיבֹתֵינוּ, "Now the congregation will lick up our entire surroundings as an ox licks up the greenery of the field." The Trisker Magid zt'l (Magan Avraham מואב ויקץ ה"ד) writes that this alludes to Yosef, who is called שור, ox, as it states (Devarim 33:17) שורו בכור, about Yosef HaTzaddik. Yosef represents kedushah, and caution from aveiros related to not guarding the eyes, etc. Thus, the pasuk is implying that in the merit of Klal Yisrael's kedushah, they will be able to consume all kelipos.
