Uktzin, Chapter 3, Mishnah 9. Throughout this chapter we have been tracing the precise instant at which an item passes a threshold and becomes capable of contracting tumah. Our mishnah gathers three such thresholds: the point at which a fish ceases to be a creature and turns into food, and the point at which a branch or a stalk of grain ceases to belong to the ground and becomes a separate object.
From when are fish mekabel tumah?
A baal chai, any living creature, is not mekabel tumah, so fish swimming about alive in a pond are outside the system entirely. Hence the mishnah's question, "me'eimasai mekablin tumah": at what stage do we begin to view them as ochel, food, which can indeed take on tumah?
On this point Beis Shammai and Beis Hillel part ways.
- Beis Shammai omrim: "mishe'yitzodu," from the moment of the catch. Once a person has trapped them intending to eat them, they carry the status of food immediately, even while they still flap about outside the water. Fish need no shechitah, so no remaining act separates the catch from the meal, and they become mekabel tumah straightaway.
- Beis Hillel omrim: "mishe'yamusu," not until they have actually died.
Rabbi Akiva adds a further measure: "im yecholin lehachayos," so long as the fish have not passed the point of no return, meaning that putting them back into water would restore them and they would swim and live again, they are still not mekabel tumah.
A fig branch held on by its bark
The mishnah moves on to a question of attachment: "yichor shel te'einah shenifsach," a fig branch that has snapped, "u'me'ureh be'klipah," and yet remains fastened to the tree by its bark. The wood itself has broken all the way through, while a strip of bark still keeps branch and trunk together.
Does such a branch retain the status of mechubar, joined to the ground, and therefore stay outside tumah? Or has the break in the wood already accomplished a separation?
- Rabbi Yehudah metaheir. In his view the branch is tahor. We do not treat it as detached, because the bark continues to bind it to the tree, and however thin that bond may be, the branch retains the status of mechubar lekarka and cannot take on tumah.
- Vachachamim omrim: everything hinges on whether the bond is a living one. Picture the break being wrapped and tied so that branch and trunk are secured together again. Should the wood then heal and the branch resume drawing sap through the tree, it is not mekabel tumah. But if it would dry out even after being tied up, because nothing reaches it through that point of contact, then the bark counts for nothing: the branch is deemed detached and is mekabel tumah.
Grain held by a single root
Lastly the mishnah speaks of "tevuah shenekrah," standing grain that has been ripped up from the soil, "u'me'ureh afilu beshoresh katan," which nevertheless remains fixed by so much as one small root. The ruling is "tehorah": such grain stays tahor. Its status is still mechubar lekarka, since a single slender root anchoring it in the earth is enough to sustain the plant's life.
Three rulings, one principle: the boundary between creature and food, and between rooted and severed, is set not by how a thing looks but by whether life is still able to pass through.