Rabbi Yissocher Frand:
On the eighth day of the consecration of the Miskhan, following the 7 day period of inauguration, the Jewish people were told to bring a number of sacrifices. Included among them was a goat for a sin offering. The Toras Kohanim suggests that this was an atonement for the sin of selling Yosef. To cover up the crime of selling their sibling into slavery, Yosef’s brothers slaughtered a goat and dipped Yosef’s coat into the blood of the goat to make it look like Yosef was killed by a wild animal.
The Oznaim L’Torah from Rav Zalman Sorotzkin asks an obvious question: Why is this symbolism appropriate now at the dedication of the Mishkan? Maybe it would have been appropriate when they left Egypt to have the Paschal Offering be a goat rather than a lamb. After all, they wound up in Egypt because of the sale of Yosef. Now that they were leaving, it would be an appropriate time to lay the matter of their guilt permanently to rest and bring an atonement offering. This was not done at that time. Rather, the symbolic recollection of that earlier event only occurs now, many months later, when the Mishkan is being dedicated. Why?
The Oznaim L’Torah gives a very logical answer. The underlying cause of the sin of Yosef’s sale was unfounded hatred (sinas Chinam). Part of the function of the Mishkan was to act as a unifying force within the Jewish people. That is why emphasis is placed on the fact that it was “in the midst of the camp.” The Mishkan was the focal institution of the nation, geographically as well as spiritually. It served to unify Klal Yisrael.
