Reference for Bava Kamma 218:13

ודין הוא בשל אחרים אני זוכה בשל עצמי לא כ"ש

This, however, is not so: for while this may be true<span class="x" onmousemove="('comment',' That a priest may retain for himself the priestly portions in his possession. ');">²⁰</span> of a thing in which he had no share, since in that case just as he had no share in it, so has nobody else any share in it, it is not necessarily true<span class="x" onmousemove="('comment',' That a priest may retain for himself the priestly portions in his possession. ');">²⁰</span>

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