At the inauguration of the Mishkan, there was a handover process where Moshe gave the post he had filled for 7 days to Ahron, where Ahron offered sacrifices as part of his new role:
וַיִּשָּׂא אַהֲרֹן אֶת [ידו] יָדָיו אֶל הָעָם וַיְבָרְכֵם וַיֵּרֶד מֵעֲשֹׂת הַחַטָּאת וְהָעֹלָה וְהַשְּׁלָמִים. וַיָּבֹא מֹשֶׁה וְאַהֲרֹן אֶל אֹהֶל מוֹעֵד וַיֵּצְאוּ וַיְבָרֲכוּ אֶת הָעָם וַיֵּרָא כְבוֹד הֹ’ אֶל כָּל הָעָם – Ahron raised his hands towards the people and blessed them. He then descended from preparing the offerings. Moshe and Ahron then went into the Tent of Meeting; they came out and blessed the people, and the glory of the Lord appeared to all the people. (9:22,23)
There are two distinct blessings; one before and one after going into the Mishkan. Rashi explains that the first blessing was Birchas Kohanim, and the second was וִיהִי נֹעַם אֲדֹנָי אֱלֹהֵינוּ עָלֵינוּ וּמַעֲשֵׂה יָדֵינוּ כּוֹנְנָה עָלֵינוּ וּמַעֲשֵׂה יָדֵינוּ כּוֹנְנֵהוּ – that our handiwork is an expression of godliness.
There is a difficulty with the word וַיֵּרֶד – that Ahron “descended”. The Torah does not emphasise “descent” from the Mizbeach anywhere else – so what does it mean here?
Perhaps Ahron experienced an emotional descent – his joy fell into sadness.
There is a tradition that some words are pronounced differently to how they are spelt; we read יָדָיו – his hands, plural, but the word is spelt ידו – his hand, singular. Ahron’s first offering was not accepted in Heaven, as he felt proud that he earned his office by his own hand (ידו). He lost sight of the fact that his hands were for the service of the people (יָדָיו).
When he saw his offering rejected, וַיֵּרֶד – he literally “became down”,i.e. miserable, at which point Moshe, who had already performed the duties for 7 days, took him aside to explain him how to perform the service properly. When they came out again, they blessed the people again – וּמַעֲשֵׂה יָדֵינוּ כּוֹנְנָה עָלֵינוּ וּמַעֲשֵׂה יָדֵינוּ כּוֹנְנֵהוּ – that we can only work properly when we clearly understand that our hands work exclusively to serve G-d; precisely what Ahron had just learned.
It is worth noting that even performing the actions correctly was not enough for the service to be accepted; even the intentions had to be perfect too.
My grandfather says that each day, we say הללוהו בנבל וכנור – they praise Him with a guitar and harp. A harp is called נבל – from the same root as the word “corpse”. My grandfather explains that the words are related in that a harp makes such a beautiful sound it makes other instruments sound bad in comparison. Chazal teach that someone who gains honour at someone else’s expense is a disgrace.
To engaged in public service, it is imperative not just to do the right thing, but to do it in the right way.