Reference for Chagigah 17:8

מופנה דאי לאו מופנה איכא למיפרך מה לשביעי של פסח שכן אינו חלוק משלפניו תאמר בשמיני של חג שחלוק משלפניו

["Atzeret" must be] free [as a redundant word in the verse to make it a true incontrovertible gezeira shava]. For if it were not free, one could confute [this interpretation by pointing out a difference between the cases that would not allow a connection based off a simple similarity of words]: The [particular characteristic of] the seventh day of Pesach,that it is not separated [halachically] from [the days] preceding it, you're going to say that about the eighth day of Sukkot [i.e. Shemini Atzeret], that is separated from [the days] preceding it [halachically]? Truly, it is definitely free [to be considered an incontrovertible gezeira shava].

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