Többszörös choméc máámid

Leaven of terumah and of kilayim of the vineyard which fell into dough, this one is not sufficient to cause fermentation, nor is that one sufficient to cause fermentation, but together they cause fermentation:It [the dough] is prohibited to non-priests and permitted to priests. Rabbi Shimon permits it to both to non-priests and to priests.

[Anything which has become subject to the law of terumah through] a mixture can affect a [second] mixture only in proportion. [Dough] leavened [through terumah] can affect [other dough] only in proportion. Drawn water can disqualify a mikweh only in proportion.

One is obligated to destroy beer made from wheat or barley [before Passover]. And, similarly, if one made cheese from vinegar from wheat or barley beer, one is obligated to destroy that cheese [prior to Passover].

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And dough that was leavened with a teruma leavening agent is forbidden to those for whom teruma is forbidden even if the ratio between the non-sacred and the teruma is greater than one hundred to one. If a portion of that dough was intermingled with non-sacred dough, it leavens only according to the calculation of the percentage of the original leavening agent in the entire dough, and the second dough is forbidden only if the quantity of the original teruma leavening agent inside it is sufficient to leaven it. And if three log of drawn water were poured into a ritual bath with less than forty se’a to complete the requisite forty se’a, the ritual bath is invalidated. But drawn water invalidates the ritual bath only according to calculation, as explained in the Gemara.

[The following rule applies when] yeast that comes from mixed species in a vineyard and from terumah falls into dough and there is not enough of either of [the forbidden substances] alone to cause the dough to rise, but when the two are combined, there is enough to cause the dough to rise. This dough is forbidden to an Israelite, but permitted to the priests.Similarly, when spices that come from terumah and from mixed species in a vineyard fall into a pot and there is not enough of either of [the forbidden substances] to spice the pot, but together there is enough of both of them to spice the pot, that pot is forbidden to an Israelite - for an entity forbidden to him spice it - and permitted to the priests.

As we learned in a mishna (Orla 2:11): In a case of non-sacred leaven and leaven of teruma that fell together into a non-sacred batch of dough, and this one alone was not potent enough to cause the dough to become leavened, and that one alone was not potent enough to cause the dough to become leavened, and they combined and caused the dough to become leavened, Rabbi Eliezer says: I follow the final element to fall into the dough. If the teruma fell in last, the dough is prohibited to non-priests. And the Rabbis say: Whether the forbidden item, i.e., the teruma, fell in first or the forbidden item fell in last, it is prohibited only if there is enough of the prohibited leaven itself to cause the dough to leaven.