Ohalos 11:6-7

Ohalos 11:6

If impurity was in a house and ritually-clean individuals overshadowed it, Beis Shammai rules them clean and Beis Hillel rules them unclean.

Ohalos 11:7

Let’s say that a dog ate the flesh of a corpse and died, lying on the threshold. Rabbi Meir says that if there’s a handbreadth opening in the dog’s neck, it can convey impurity, but if not, then it doesn’t convey impurity. Rabbi Yosi says that we must investigate the impurity. If it lies opposite the door’s lintel and inward, then the house is rendered unclean; if it lies from opposite the lintel and outward, then the house remains clean. Rabbi Eliezer says that if the dog’s mouth is facing inward, then the house remains clean; if its mouth is facing outwards, the house is rendered unclean because the impurity exits through the dog’s hindquarters. Rabbi Yehuda ben Baseira says that in either case the house is rendered unclean. The impurity can remain in the dog’s entrails for three 24-hour periods. When it comes to fish and birds, Rabbi Shimon says the impurity can remain in their entrails as long as it takes to fall in a fire and be consumed; Rabbi Yehuda ben Baseira says one 24-hour period in the case of fish or birds.