Commentary for Avodah Zarah 58:11
זבח גופיה מנלן דכתיב (תהלים קו, כח) ויצמדו לבעל פעור ויאכלו זבחי מתים מה מת אסור בהנאה אף זבח נמי אסור בהנאה
But from where do we know that an [idolatrous] sacrifice itself is prohibited? As it is written, “They joined themselves to Baal Peor, and ate the sacrifices of the dead” (Psalms 106:28): Just as deriving benefit from the dead is forbidden so too idolatrous sacrifices are prohibited.
Daf Shevui to Avodah Zarah
The Talmud now asks the obvious question—how do we know that idolatrous sacrifices are prohibited. This is derived from Psalms which compares sacrifices to the dead. It is prohibited to derive benefit from body parts of the dead (unless one is doing so to save a life, so organ transplants are allowed).
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