NUM30 It was taught: He shall warn her: not in the midst of frivolity, or casual talk, or light-headedness, or strife, or fright [But in reasoned, serious manner]. If he did warn her in one of the above states, what is the halachah? It is as we have said: Wherever "statute" or "law" is mentioned, the halachah is categorical [i.e., if not observed as stated, it is non-ineffective] (Yerushalmi Sotah 1:1)
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