Reference for Bekhorot 94:23

לא נצרכא אלא לבא אחריו

the meaning being as follows: He is a first-born to be redeemed from a priest<span class="x" onmousemove="('comment',' The doubtful son in any case has opened the womb and is therefore a first-born in this respect, to be redeemed later by himself.');">¹⁵</span>

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