ユダヤ教で「有償での血液提供」は罪ですか？

Judaism's blood-donation framework begins with the highest possible endorsement: pikuach nefesh, the saving of life, overrides nearly every commandment — and a community blood supply is that principle systematized. The classic line: 'whoever saves one life, it is as if he saved an entire world' (Sanhedrin 37a), quoted on donation posters across Israel, where the medical system was built on halakhic analysis of exactly these questions. The payment question: the Torah's blood prohibitions ('you shall not eat the blood,' the blood covered with earth) govern consumption, not the supply chain; contemporary poskim rule that donation is permitted and payment for time is like wages — the leading responsa (including Rav Waldenberg's Tzitz Eliezer generation) treat blood and plasma donation as a mitzvah with logistic costs. The Donating-for-money caution rabbis do raise: honesty in screening (endangering recipients violates 'do not place a stumbling block'), and frequency — the body-guard duty applies to the serial donor running on empty. There is also a distinct Jewish institution: the gemach model — free loan societies — extended to blood, where community registries donate as pure chesed, and the ethic is the aspiration: give as if to family, because it is.