Positive Mitzvah 106: Impurity of a "Zavah"
Leviticus 15:1 "And if a woman has a discharge..."

Zavah is a state of impurity that may befall a woman.

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The Alter Rebbe wrote: The souls are all one. Only the bodies divide us. The Alter Rebbe continued: Therefore, one who places the body before the spirit can never experience true love or friendship.

From: Bringing Heaven Down to Earth by Tzvi Freeman - tzvif@aol.com