Parshas Masei
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And they traveled from the Wilderness of Sinai and encamped in Kivros Taavos.
It says that Joseph was thrown into the pit by his brothers that contained ‘no water’, from here the Talmud infers that there were snakes and scorpions in it- from this the commentators infer that when Torah (represented by water) is absent, snakes and scorpions arise (denoting the Yetzer Hara).
In Kivros Hataavas (Tavvos means desires) the Yidden had these Taavos due to the lack of Torah, which is the antidote to the Yetzer Hara.
(Kerem Hazvi)