By Makkas B'choros, the: בְכוֹר הַשְבִי firstborn in captivity also died (although they were in prison and did nothing to hurt the Yidden) since they were happy with the Tzara of Klal Yisroel. They did zero, since they were locked up, yet they get the identical punishment of a Mitzri who actively tortured Jews. מִדָּה טוֹבָּה מְרוּבָּה How much more is this true in a positive way! If Ahron is happy with Moshe’s greatness, he gets all that greatness, as if he did everything Moshe did! Ahron was buried on: ה ר הָּהָּר Hor HaHar, a mountain on top of a mountain, which symbolizes the double Schar that every Ayin Tova person gets (for his own AND his friend’s accomplishments). The super beautiful dazzling treasure of the Choshen is a Siman of the unbelievable fortune Klal Yisroel has when they work together and appreciate each other’s greatness. The Choshen symbolizes the beauty of a person with pure Middos.
The Gr”a says: עִיקָּר חִיוּת הָּאָּדָּם שְבִירַת הַמִדוֹת the main existence of a person is for Shviras HaMiddos. Look at the unreal beauty of Shleimus HaMiddos. When working on your Middos, remember what utter greatness and Simcha you are aiming at. Think of the expensive Choshen; which symbolizes the Gan Eden of a pure heart!
The Choshen is called Urim v’Tumim, which can be a Remez to the “light” that pure Middos give you, and the “Temimus” you need to get there. You are like a Tam who doesn’t look at what’s not his, and is always Sameach B'chelko. הָּאֱלֹקִ ים עָּשָּׂה אֶּת הָּאָּדָּם יָּשָּר וְהֵמָּה בִקְשוּ חִשְב נוֹת רַבִים קהלת ז כט Hashem created Man straight and simple, but their Yetzer Hara entices them to seek complications.
