12. It is forbidden on Shabbos to measure anything for a practical purpose, unless doing so is required for the fulfillment of a mitzvah (1).

13. One may speak about one's business affairs either to a Jew or to a Gentile on Shabbos, [only] if failing to do so would cause a [substantial] financial loss.

FOOTNOTES:

(1) Measuring is one of the activities included in the general rabbinic prohibition called "Uvdah De'Chol" ("weekday work").

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