Liturgy for Sukkah 76:1
הלכתא גיברתא איכא למשמע ממנהגא דהלילא הוא אומר הללויה והן אומרים הללויה מכאן שמצוה לענות הללויה
One can deduce important halakhot from the custom of [reciting the] Hallel. 1) Since he says Halleluyah and they respond Halleluyah it may be inferred that it is a mitzvah to answer Halleluyah
Hallel
Blessed are you Lord, master of the universe, who has sanctified us with His commandments and commanded us to recite the Hallel.
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