Reference for Chullin 267:48

ספק איסורא לחומרא ספק ממונא לקולא

we must take the more stringent view, where the doubt concerns a monetary matter we take the more lenient view.<span class="x" onmousemove="('comment',' The priestly dues are in no wise sacred and the omission to give them does not render the animal forbidden; consequently, it is only a monetary consideration, and in a case of doubt it is for the priest, the claimant, to establish his claim.');">³⁵</span>

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