Reference for Bekhorot 97:10
לאחר ל' יום אע"פ שלא נתן יתן
<big><b>MISHNAH: </b></big>IF THE SON DIES WITHIN THIRTY DAYS [OF HIS BIRTH] ALTHOUGH HE [THE FATHER] GAVE THE PRIEST [THE FIVE SELA'S], HE MUST RETURN THEM.<span class="x" onmousemove="('comment',' Because the offspring is an untimely birth (Rashi) . Tosaf. says: The reason is because the Torah makes redemption dependent on the offspring being a month old. The Mishnah here refers to certain cases of first-born.');"><sup>10</sup></span>
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