The Routledge Dictionary of Judaism
(Hebrew: “usury”) Any fee paid for waiting for the return of money that one has lent; this covers fees in kind, such as free rent, or even fees in personal services.
These are absolutely forbidden in transactions between Israelites but permitted between Israelites and gentiles. Israelites may pay interest to gentiles or collect it from them; in interactions with other Israelites, this is strictly forbidden.
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