Why did Greeks choose unblemished animals for sacrifices?

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In the context of Greek religion, it was essential that sacrificial animal victims be free of blemish because the offering represented a gift to the gods and served as the principal proof of the worshipper's piety.1

Providing a physically perfect specimen was a requirement to ensure the offering was acceptable; presenting an imperfect or blemished animal was believed to be likely to offend the deity rather than honor them. This emphasis on perfection aligns with broader cross-cultural religious concepts where physically perfect specimens are considered inherently pure and appropriate for sacred use.12