Reference for Berakhot 32:8

<big><strong>גמ׳</strong></big> מ"ט דרבן (שמעון בן) גמליאל קסבר אנינות לילה דרבנן דכתיב (עמוס ח, י) ואחריתה כיום מר ובמקום אסטניס לא גזרו ביה רבנן:

GEMARA What was Rabban Gamaliel's reason? He was of the opinion that the application of the laws of mourning in the night is a Rabbinical injunction; for it is written, "And the end thereof as a bitter day" (Amos viii. 10); and in the case of a person in delicate health, the Rabbis do not so decree.

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