Midrash for Chullin 267:3
על מנת אחוץ קא רמית חוץ שיורא על מנת לאו שיורא
'On condition that the dues shall be given to me', he may nevertheless give them to any priest he chooses!<span class="x" onmousemove="('comment',' For the condition is contrary to Scriptural law, since by Scriptural law the owner has a power of disposal of the dues to whom he will, and it is therefore null and void. The purchaser then can dispose of the dues as he wishes, but he is bound to give them, thus apparently in conflict with our MISHNAH:');"><sup>2</sup></span>
Sifrei Devarim
"from the slaughterers of the slaughtering": The time of the slaughtering is the criterion. From here they ruled: If a stranger converted and he had a cow — If it were slaughtered before he converted, he is exempt (from priestly gifts); if after he converted, he is liable. If the matter is in doubt (safek), he is exempt, and "the burden of the proof is upon him who would remove (the object) from his neighbor's domain.
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