For the source text click/tap here: Zevachim 106
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The Mishnah taught that if someone unintentionally slaughters and offers an animal outside the courtyard of the Mikdash, he is liable for a chattas for slaughtering and a separate chattas for offering that animal.
The Gemara immediately identifies the source in the Torah where we find both a warning (Devarim 12:13) and a statement of punishment (Vayikra 17:8-9) for one who offers such an animal.
The Gemara then notes that although the punishment of kareis for slaughtering an animal outside the courtyard is found in Vayikra (17:3-4), it is not clear where the warning for this offense is mentioned. Rashi explains that there cannot be a chattas obligation without the Torah warning that such an act is prohibited.
We further explore the parameters of shechutei chutz.