Large and Small Amounts

Charity collectors may take something
worth a small amount from women, but
not something worth a large amount,
as it is possible that they do not have
permission to give away expensive items.

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And with regard to olive pressers,
one may purchase from them olives
in a substantial measure, and oil
in a substantial measure, as there
is no concern that they would
steal such a large amount.
But not olives in a small amount,
   and not oil in a small amount.