Reference for Bekhorot 97:8

ותנא דידן כיון דבשני אנשים הוא דמשכחת לה באיש אחד ושתי נשים לא משכחת לה לא מתני ליה:

- Since this is the case only where there are two husbands but not where there is only one husband and two women,<span class="x" onmousemove="('comment',' Because in such a case there is one first-born and he must therefore give five sela's to the priest.');">⁸</span>

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