Machshirin 4:4-5

Machshirin 4:4

Regarding a barrel of fruit into which rain run-off poured, Beis Shammai say that the barrel must be broken (in order to keep the fruit from becoming susceptible to ritual impurity); Beis Hillel say that one may pour out the water. Beis Shammai agree, though, that one may reach in and remove fruit from the barrel without rendering them susceptible to impurity.

Machshirin 4:5

If rain runoff fell in a trough, ki yutan doesn’t apply to water that splashes out or overflows the trough. If one took the trough to pour out the water, Beis Shammai say ki yutan applies and Beis Hillel say it doesn’t. If he intentionally put the trough where the run-off would fall into it, Beis Shammai say ki yutan applies to water that splashes out or overflows, and Beis Hillel say it doesn’t; if one took the trough to pour out the water, both say that ki yutan applies. If a person immerses utensils or washes his clothes in a cave, ki yutan applies to the water that comes up with his hands but not to the water that comes up with his feet. Rabbi Elazar says that if he can’t go into the cave without getting his feet dirty, then ki yutan also applies to the water that comes up with his feet.