Midrash for Chullin 268:13
ואם אין שם כהן מעלין אותן בדמים ואוכלן מפני הפסד כהן
one should not remove the skin from the shoulder;<span class="x" onmousemove="('comment',' But one should give it to the priest with the skin upon it.');"><sup>12</sup></span>
Sifrei Devarim
"the shoulder": the right shoulder.
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