Midrash for Chullin 264:1
אמר רב אושעיא
- R'Oshaia said: This [firstling] had already been received by the priest but when it suffered a blemish he sold it to an Israelite.<span class="x" onmousemove="('comment',' So that the priest's claim is only in respect of the dues.');"><sup>1</sup></span>
Sifrei Devarim
"from the people": and not from others (i.e., gentiles), and not from his fellow Cohanim.
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