Midrash for Chagigah 11:13
ודקאמרת נילף מנשיאים דנין דבר הנוהג לדורות מדבר הנוהג לדורות ואין דנין דבר הנוהג לדורות מדבר שאינו נוהג לדורות
And for that which you are saying, that we should learn from "the princes," we can compare something that will always apply to a thing that will always apply, and we can not compare a thing which will always apply to a thing which will not always apply.
Sifrei Devarim
R. Yossi Haglili says: Three mitzvoth obtain on a festival: the festive offering (chagigah), the sacrifice of peace-offerings, viz. (27:7) "And you shall sacrifice peace-offerings and you shall eat them there"; "appearance" (re'iah), before the L-rd with a burnt-offering, viz. Shemoth 23:15); and rejoicing (simchah).
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