For the source text click/tap here: Bava Metzia 115
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Our Mishnah speaks of a case where taking a mashkon is forbidden is when the guarantee would be a millstone or some other implement or utensil that is needed for preparing food at home. The basis for this is also a clear passage in Sefer Devarim (24:6), which is understood to forbid the taking of a mill or anything similar.
The Mishna is referring to a small hand mill that was used in homes.
Hand mills were made with a hole in the top where the grain could be inserted and another on one side where a stick could be placed, allowing the grindstone to be turned. These were often used at home and turned by women who were responsible for running the kitchen.
We explore the laws of Deut 24 and possible relationship to the decalogue as well as the struggle to see the Torah in light oof accent near eastern codes.