Reference for Niddah 57:63

ת"ש

empty, the young that is born subsequently is deemed to be a firstling of a doubtful nature'.<span class="x" onmousemove="('comment',' Since it is unknown whether it followed the birth of a developed embryo, in which case it is no firstling, or the abortion of an inflated sac, in which case it is a valid firstling. A doubtful firstling may be eaten by its owner after it had contracted a blemish and the priest has no claim upon it. ');">⁵⁶</span>

Jastrow

Jastrow

Jastrow

Jastrow