Reference for Chullin 62:43

טעמא דנפלה הא הפילה הוא כשרה ואע"ג דלא מיכוין

Therefore, if it is essential to have the intention to cut, it is also essential to have the intention to slaughter [according to ritual], and if it is not essential to have the inten to slaughter [according to ritual], then it is not even essential to have the intention to cut.

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