Chabad Knowledge Base
(lit. "four guardians") A "shomer," or guardian, is someone responsible for an object belonging to another. The Torah describes four types of guardians, each with a varying degree of responsibility: 1) the unpaid guardian, 2) the paid guardian, 3) the borrower and 4) the renter.
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Entry for 'Arba Shomrim'. Chabad Knowledge Base. https://www.studylight.org/dictionaries/eng/ckb/a/arba-shomrim.html. 2012.