Musar zu Bereschit 12:8

The first quality: Know that the love of Abraham, peace be upon him, was to teach all those who came into the world the service of the Creator, blessed be He, and proclaim His name always, as it is said (Genesis 13:4), “And Abraham called there on the name of the Lord.” It is also said (ibid., 12:8), “And he built an altar unto the Lord, Who appeared unto him.” And it is said (ibid., 21:33), “And Abraham planted a tamarisk tree in Beersheba and called there on the name of the Lord.” These verses are to let you know that every place that Abraham went he would call on the name of the Lord and would occupy himself with service to Him. He was not restrained from doing so by the fear of the nations of the world.

Nonetheless, there was a partial rehabilitation through the construction of the Tabernacle called מקדש, Sanctuary, which served as an illustration of how the material and spiritual worlds are inter-related, as I have explained on פרשת תרומה and on פרשת ויקהל-פקודי. It was equivalent to a new act of creation, a rejuvenation of the universe as it were. In that rejuvenated universe Aaron took the place of Adam. Of Aaron the Torah writes specifically that he should be brought "close," i.e. that he should personify what Adam had personified prior to the latter's sin. (cf. Exodus 28,1 and the Midrash I have quoted in connection with that verse). In our physical universe Aaron's function as High Priest corresponds to the function of the High Priest in the Celestial Region who offers the souls of the righteous on an altar (Chagigah 12). We have illustrated this by quoting כי היום ה' נראה אליכם (Leviticus 9,4) and showing that the words נראה אליכם nhna comprise the same letters as אהרן , מיכאל. This is an allusion to Aaron's function here on earth being similar to that of the archangel Michael in Heaven. Aaron was to bring about the closest rapprochement possible between man and G–d Instead of offering the souls of the righteous, Aaron could only offer animal sacrifices i.e. from the domesticated beasts such as the cattle and the sheep. This was basically no different from what Adam himself had done after he had sinned, when he sacrificed the ox which is reputed to have had a single horn on its forehead (Shabbat 28). Noach offered animal sacrifices in expiation for a corrupt human society which had been punished. Abraham did likewise in order to obtain forgiveness for the sin of the generation of the Tower of Babel. It is written of him ויבן שם מזבח לה' ויקרא בשם ה', "He built there an altar for the Lord, and proclaimed the name of the Lord" (Genesis 12,8). Not only did Abraham offer animal sacrifices, but he even offered his only beloved son Isaac as a sacrifice.