Reference for Chagigah 7:5

אצטריך סלקא דעתך אמינא נילף ראייה ראייה מהקהל מה להלן נשים חייבות אף כאן נשים חייבות קמ"ל

[The verse] is needed. You might have thought We should learn "appearing"/"appearing" [scriptural connection] from Hakhel: Just as in the latter case, women are obligated [to come to Hakhel], so too here, women [should be] obligated. We learn from this [verse that this is not so].

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