Hassidout sur Le Lévitique 6:13

And in the Midrash (Vayikra Rabbah 8:3), "'This is the offering of Aharon' (Leviticus 6:13) - the offering of Aharon was considered as beloved as the offering of the chieftains, as it is written (Numbers 7:17), 'This was the offering of Nachshon, etc.'" And the idea is that the princes' dedication [of the tabernacle] was so that the enlightenment of the rebirth that occurred with the erection of the tabernacle would remain. For it is written (Numbers 7:2), "And the chieftains of Israel offered (hikrivu, which more literally means, brought close)" - that they felt a coming close in their souls to the Holy One, blessed be He. And the dedication was so that an impression of this would remain for future generations. However Aharon the priest was always cleaving to this rebirth. And this is what Scripture was consoling him with, "Yours lasts forever" - see there in the Midrash of Behaalotekha - to say, that he does not need the dedication, since he feels rebirth every day. This is as it is written (about Aharon), "This is the offering" - and that is as if it is pointing with the finger that this thing does not get old for him. And in fact we see that the tribe of Levi did not volunteer during the dedication of the tabernacle. And at first glance, this is a wonder! For the bringing of their offerings began from themselves, with the advice of Netanel ben Tzuar. If so, why did the tribe of Levi not also participate in this? Hence it appears that the tribe of Levi, which was not involved in the sin of the [golden] calf did not feel excitement about the erection of the tabernacle, like the other tribes did. For their level was above the construction of the tabernacle, just like the Children of Israel were [all] prepared to be before that sin. But behold they themselves are the servants of the tabernacles, so that they are called the vessels of the tabernacle and the temple. But the other tribes did bring offerings, so that the enlightenment of the erection of the tabernacle would remain with them forever. So does it appear to me.