משנה על אהלות 11:7

If a rooster that swallowed a sheretz fell within the air-space of an oven, the oven remains clean; If the rooster died, the oven becomes unclean. If a sheretz was found in an oven, any bread in it contracts second degree impurity since the oven is of the first degree.

Hatat water that became invalid, it may not be mixed into the mud since it might become a snare for others. Rabbi Judah says: it becomes neutralized. A cow that drank of the hatat water, its flesh becomes unclean for twenty-four hours. Rabbi Judah says: it becomes neutralized in its bowels.