Reference for Chullin 78:10

אלא אמר רב שיזבי

Or you might argue thus: Perhaps R'Eliezer maintains his view only there [in our Mishnah], because it deals with a heathen, and he is of the opinion that the thoughts of a heathen are usually directed towards idolatry, but here since we are dealing with an Israelite it would not be right to say that his last act proves what he had in mind at the beginning.<span class="x" onmousemove="('comment',' For it is not conclusive that because after the slaughtering he expressed an intention for idolatry this intention was present at the time of slaughtering.');">⁶</span>

Jastrow

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