The Jewish Calendar and Holidays (incl. Sabbath): Passover: Leaven:
What is the spirtual significance of leaven?
Leaven is forbidden on Passover to remind us that our
ancestors left Egypt in a hurry and didn't have time
for their dough to rise (Ex.12:34,39). In addition,
leaven has become symbolic of the evil inclination,
which the Talmud (Berachos 17a) refers to as "the
leaven in the dough". But actual leaven is forbidden
only on Passover; it may symbolize the evil inclination,
but it isn't itself regarded as evil.
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