דִּין פְּרוּטָה כְּדִין מֵאָה, דִּין שֶׁל פְּרוּטָה כְּדִין שֶׁל מֵאָה מַנֵּה

ביטוי (אנגלית)

In for a penny, in for a pound

הגדרה (אנגלית)

This principle, which began concerning a large sum, also applies regarding a small amount of money or a minor matter. The legal relation to a small sum must be identical to the relation that applies to large sums (originally: the prutah was a low-value coin used in the past and also in the early years of the state).

("As small as it is, so great shall you hear (Deuteronomy 1) - Reish Lakish said: Let the law of a prutah be dear to you as the law of a hundred maneh" - Sanhedrin 8a)