Reference for Shabbat 258:14

אמר רב נחמן אמר רבה בר אבוה אמר רב הלכה כר' יוסי

The first day of the month and the second [cause] weakness; the third is dangerous. The eve of a Festival [causes] weakness; the eve of Pentecost is dangerous, and the Rabbis laid an interdict upon the eve of every Festival on account of the Festival of Pentecost, when there issues a wind called Taboah,<span class="x" onmousemove="('comment',' Lit., 'slaughter'. ');">¹³</span>

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