Before you learn Bekhorot 22

Where we left off

The Gemara asked why an expelled mass must be buried if it conveys no impurity. That sugya continues onto our daf.

How can an expelled mass exempt an animal from firstborn status without imparting ritual carcass impurity?

ביטול ברוב (nullification in a majority): A minority substance loses its status when mixed into a larger quantity of another substance. Here, fetal flesh is nullified within the larger volume of blood and discharged fluids.
פתיחת הקבר (opening of the womb): A deceased fetus inside a womb releases tent impurity once the womb opens. This applies only after the fetal head rounds to a defined skein size,.
השקה (water purification through contact): Impure water in a vessel becomes pure when brought into contact with a mikveh. Other foods and liquids cannot achieve ritual purity through this method.
מצא מין את מינו וניעור (like finding like and reawakening): This principle examines whether a nullified minority substance can regain its former impure status. This occurs if it encounters additional liquid or matter of its own kind,.

Rabbi Yoḥanan (רבי יוחנן, Amora): He resolves the paradox by explaining that the fetus is nullified in a majority of blood.
Rav Huna (רב הונא, Amora): He defines the skein measurement for womb opening as a skein of wool yarn.
Rabbi Yirmeya (רבי ירמיה, Amora): He asserts that nullified water in brine reawakens its impurity when added to cooking water,.
Abaye (אביי, Amora): He questions whether ritual impurity that was once nullified can ever reawaken.