Reference for Menachot 171:7

<big><strong>מתני׳</strong></big> שלשה זיתים הן ובהן שלשה שלשה שמנים

Because it removes the hair and softens the skin. ONE MAY NOT BRING IT FROM OLIVE-BERRIES WHICH HAD BEEN SOAKED IN WATER'Our Rabbis taught: Oil from olives which had been preserved or stewed or soaked in water, or oil from the olive dregs, or from foul smelling olives may not be brought, and if it was brought it is invalid.

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