What are "Korbanam" and "Chatasam", respectively, referring to?
1.
Rashi and Ramban: "Korbanam" refers to the bull of the Olah and "Chatasam", to the goat of the Chatas.
2)
Why does the Torah add "ve'Hein Hevi'u es Korbanam ... "?
1.
Ramban #1: To stress that, in spite of the severity of the sin, since it was performed be'Shogeg and they brought their Olah and Chatas, they deserve an atonement.
2.
Ramban #2 (citing R. Yashiyah
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in the Sifri): If one tribe sinned following a ruling of its Beis-Din, and other tribes followed suite, they are all subject to bring an Olah and a Chatas.
3.
Ramban #3 (According to Kabalah): The Torah inserts both "la'Hashhem" and "Lifnei Hashem", the former, corresponds to the Midas Rachamim; the latter,
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to Midas ha'Din
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- which Chazal sometimes describe as 'Hu u'Beis-Dino'.
Ramban: We do not find this dual expression by any other sin-offering (See R. Chavel's footnotes).
3)
Why does the Torah insert the (otherwise superfluous) words "ve?Chatasam ? al "Shig'gasam"?
1.
Zevachim, 41a: "Chatasam" refers to the Se'irei Avodas-Kochavim, and "Shig'gasam", to the Par He'elam Davar shel Tzibur,
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(to which the Torah is comparing it),
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and Chatasam al Shiggasam? implies that regarding the burning of the Emurim, this Chatas is equivalent to all other regular Chata?os.