Reference for Bekhorot 91:19

רבי יוסי הגלילי אומר

IF ONE WHO NEVER HAD CHILDREN PREVIOUSLY MARRIED A WOMAN WHO HAD ALREADY GIVEN BIRTH,<span class="x" onmousemove="('comment',' The infant in this case is a first-born in respect of inheritance but not of redemption, since the right of inheritance is determined by the father, Scripture saying: 'The beginning of his strength', whereas for redemption it is the opening of the womb which is necessary.');">¹⁴</span>

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