Text version of this daf: original and translation
Pesachim 27a — the Talmud in English
And the Sages say: Whether it fell into it as a prohibited substance initially, or whether the prohibited substance fell in at the end, always the teruma leaven does not prohibit it, 
until there is in it
by itself
enough to cause leavening !
And Abaye said:
As for what Rabbi Eliezer said, “I follow the last one,” and if the permitted substance fell in last, the mixture is permitted,
this was stated
in this manner
only
when he
first removed the
leaven
of the prohibited substance
that had fallen in initially, and after he removed it, the non-sacred leaven fell into it. Since he removed it before the dough became leavened, the leavening is not attributed to it at all. Rather, the permitted leaven alone caused the dough to become leavened. And although without the initial action of the prohibited leaven the permitted leaven would not have been able to complete the leavening, nevertheless, since at the time of the leavening the prohibited substance had already been nullified and was gone, it does not become reawakened.
But
if he
did not first remove the
leaven
of the prohibited substance
from the dough before the permitted leaven also fell into it, and the leavening was completed by both of them together,
the dough is prohibited
as teruma.
And although the dough did not become leavened on account of the prohibited substance alone, but both the prohibited leaven and the permitted leaven contributed to its leavening, it is nevertheless prohibited.
Apparently,
Rabbi Eliezer holds that whenever
this and that cause it ,
it is also
prohibited .
And the Rabbis hold that “this and that cause it” is permitted!
And they likewise disagree concerning a new oven that was heated with shells of orla. As for the teaching that it “must be demolished,” that follows Rabbi Eliezer. According to him, every loaf baked in it is prohibited, even if it is heated again with a new, permitted fuel. For the prohibited heating that completed the firing of the oven also contributes to the loaf that will be baked in it. And “this and that cause it” is prohibited.
And as for the teaching that it “must be cooled,” that follows the Rabbis. Since the prohibited heating by itself does not cause the loaf, but only in combination with the heating from the permitted wood used afterward, the loaf is permitted. For “this and that cause it” is permitted. Therefore, the oven need not be demolished. [
And the requirement to cool it is only a matter of the proper procedure initially. For whenever “this and that cause it,” it is permitted only after the fact. Since by cooling it one does not impair the oven itself, but only the heat produced by the prohibited benefit, it must be cooled.
Tosafot.]
And we raise an objection:
From where do you know that Rabbi Eliezer’s reasoning is as Abaye explained,
and that Rabbi Eliezer permitted it only when the prohibited substance had first been removed?
Perhaps Rabbi Eliezer’s reasoning
is as implied by the plain wording of his statement,
because
he says,
“I follow the last one”!
“This and that cause it” is always permitted. And if the prohibited substance fell in first, the dough is always permitted.
It makes no difference whether he first removed the prohibited substance, and it makes no difference whether he did not first remove the prohibited substance.
Rabbi Eliezer prohibited it only when the prohibited substance fell in last, because we follow the completion of the process. Since the leavening was completed by the prohibited substance, the dough is prohibited.
But
if both of them fell in
at the same time, it is likewise permitted.
And we answer:
Rather,
from
Rabbi Eliezer’s ruling concerning the wood of an asheira
we learn that he holds, “this and that cause it is prohibited.”
As we learned:
From it [
the asheira] he took
wood, and it is
prohibited to derive benefit from it!
For idolatry is prohibited from which one may derive no benefit, as it is written: “Nothing from the doomed property shall cling to your hand.”
And if he
used them [
from the wood of the asheira] to heat
the oven—
if it is
new, it must be demolished.
And if it is an oven
old,
which had already been fired and whose construction had been completed,
it must be cooled!
One may not bake bread in it until it has cooled from the heating produced by the prohibited fuel.
If he baked the bread in it, it is prohibited to derive benefit from it!
And if that bread
became mixed
with
с
loaves
other
loaves, all of them are prohibited.
And
if bread from those loaves became mixed with
other
loaves that had become prohibited because of the mixture,
with
loaves
other,
all of them are prohibited
from deriving benefit! For idolatry is not nullified even in a majority, not even in a thousand-to-one ratio. It prohibits its mixture, and the mixture of its mixture.
Rabbi Eliezer says: He shall take the benefit
alone
to the Salt Sea!
He must destroy the money he gained by heating the oven with the asheira, and cast the value of that wood into the Salt Sea , so that he will not benefit from the value of the idolatry. But the bread itself is not prohibited, for it is not actually an object of idolatry; rather, the enhancement contributed by the wood is present in the bread. The prohibited cause is considered merely like an admixture of idolatry. [Rashi, based on the Ran there].
The Sages said to him,
the
Sages:
There is no redemption for idolatry! Even bread that became prohibited because of the enhancement contributed by the wood of the asheira cannot be redeemed. It is not enough to destroy the value of the benefit; it remains prohibited forever and likewise prohibits its mixture.
In any event, we learn from Rabbi Eliezer’s statement that as long as he has not taken the value of the benefit to the Salt Sea, he agrees with the first tanna that a new oven heated with an asheira must be demolished, and an old one must be cooled. The bread too is prohibited. Apparently, he holds that “this and that cause it is prohibited.” The beraita concerning shells of orla, which teaches that a new oven must be demolished, likewise follows his opinion. [
The same would apply if we could establish the beraita concerning shells of orla as following Rabbi Eliezer’s opponent, the first tanna. For it explicitly says, “a new oven must be demolished.” However, since we do not know who that tanna is, it is preferable for us to establish it as following Rabbi Eliezer. In truth, the Gemara’s intention is Rabbi Eliezer and his disputant.]
And the beraita that teaches, “Whether new or old, it must be cooled,” follows the Rabbis [concerning shells of orla], who hold that even bread baked with prohibited fuel is permitted. They do not recognize at all the enhancement contributed by wood in bread, even where there is only one prohibited cause. All the more so in the case of a new oven, which need not be demolished, since the oven itself is not eaten; only the bread baked in it is eaten. And in the bread there are two causes: one prohibited cause and one permitted cause, as explained above.
And we reject this again:
Say,
that
from Rabbi Eliezer you have learned
that “this and that cause it is prohibited,” only
in the case of idolatry.
Perhaps he said this only there, because
the
idolatry
has a more stringent prohibition.
But
with regard to the other prohibitions of the Torah, have you heard Rabbi Eliezer
say this?
And we answer: Necessarily, Rabbi Eliezer said this with regard to all the prohibitions of the Torah as well. For if you say that he holds this only with regard to idolatry,
then as whom will you establish it [
that is, as whose opinion will you establish] the beraita concerning shells of orla? We find no one who says, “this and that cause it is prohibited,” other than Rabbi Eliezer, who said this with regard to an asheira. And since we find that this beraita says so with regard to other prohibitions, we must establish it as following his opinion, and say that he did not distinguish between idolatry and other prohibitions.
Furthermore,
we answer:
Is it not explicitly taught: And likewise Rabbi Eliezer would prohibit
“this and that cause it,”
with regard to all the prohibitions of the Torah!
Abaye said: If you should conclude,
that Rabbi, who prohibited in the latter clause of the beraita the bread baked with shells of orla, also holds that
“this and that cause it is prohibited,”
and he is the one who taught in the first clause, “a new oven must be demolished,” then
Rabbi is Rabbi Eliezer.
And if you should conclude
that Rabbi holds
“this and that cause it is permitted,”
and does not accept “a new oven must be demolished,”
and
prohibited only
here,
in the case of bread baked with prohibited fuel,
because there is enhancement contributed by the wood in the bread,
and there is only one prohibited cause—nevertheless,
these bowls, cups, and saucers
of earthenware, which were fired with prohibited wood,
are prohibited
even according to Rabbi. For
when Rabbi and Rabbi Eliezer disagree,
Rabbi and Rabbi Eliezer
disagree concerning an oven
and
a pot
as well. For
according to the one who says [
Rabbi Eliezer]
“this and that cause it is prohibited,”
they too
are prohibited
even though they themselves are not eaten; nevertheless, the bread and the cooked dish prepared in them are caused by them. And although they too have a permitted cause, namely, the permitted heating, they are prohibited. But
according to the one who says [
Rabbi]
“this and that cause it is permitted,” it is permitted
to bake and cook in them. For one does not derive benefit from the oven or pot itself, but from the bread and cooked dish prepared in them. They are permitted because they too have a permitted cause.
But bowls, cups, and saucers that were completed through the prohibited substance, and in which there is enhancement contributed by the wood, are prohibited to use, because a person derives benefit from the objects themselves when using them. In their case there is only one prohibited cause, without a second, permitted cause.
Some say: Even according to the one who says
“this and that cause it is permitted,”
only an oven is permitted, because there is no benefit in the oven itself without heating by permitted wood. Thus, the benefit comes through both causes together. But
a pot
that was fired with prohibited wood
is prohibited,
because one derives benefit from it even without the second cause, the permitted heating,
for it received its cooking before
the
permitted wood was placed beneath it !
The very fact that it holds the cooked dish is considered benefit. Thus, one derives benefit through the prohibited cause alone .
Rav Yosef said that Rav Yehuda said that Shmuel said:
teach thus in the aforementioned beraita:
An oven that one heated with the peels of orla or with straw of kil'ei ha-kerem: if it is new, it must be demolished; if it is old, it must be cooled!
If one baked bread in it—
Rabbi says: the bread is permitted!
And the Sages say: the bread is forbidden!
for Shmuel reversed the positions of Rabbi and the Sages.
And we raise an objection:
but it was taught
in a beraita
the opposite!
For Rabbi is the one who forbids, and the Sages permit.
And we answer:
Shmuel taught that beraita in the opposite manner
than that beraita.
And if you wish, say:
Shmuel, too, taught the beraita as it is written before us. Rather, he intentionally reversed the positions. Because
in general Shmuel holds,
“The halakha is according to Rabbi when he differs with a single colleague.”
But
not when he differs with his colleagues.
And where Rabbi differs with the many, the halakha is not according to him.
And in this
dispute Shmuel held that the halakha is according to Rabbi
even when he differs with his colleagues.
And he forbade the bread, because there is benefit of the wood in the bread.
And he thought: he taught it
this beraita
in the opposite manner, so that we should establish
the position of
the Rabbis as forbidding!
So that what he ruled here as forbidden would not contradict what we have established: “The halakha is not according to Rabbi when he differs with his colleagues.” But if he had taught the beraita in its form, and had ruled for prohibition in accordance with Rabbi, this would lead to error, and they would rule everywhere in accordance with Rabbi, even when he differs with the many.
We learned above:
If one cooked
a turnip
on coals
of orla and kil'ei ha-kerem,
according to everyone, the bread is permitted!
Rav Yehuda said that Shmuel said, and Rav Hiyya bar Ashi said that Rabbi Yohanan said,
they disagreed in explaining this ruling.
One said: They taught
that the bread is permitted
only
when one cooked it on
faint coals
(extinguished)! For even Rabbi agrees concerning them that their prohibition has already lapsed. Since their status is like the ashes of forbidden objects from which one may not derive benefit that have been burned, which are permitted.
But glowing coals
(burning, which appear to be moving and whispering to one another)
are forbidden!
Because they are not included in the category of ashes, and their prohibition has not yet lapsed. Therefore, the bread that was baked with them is, according to Rabbi, forbidden.
And one said: Even glowing coals, too, are permitted!
For according to everyone, they are like ashes, and their prohibition has lapsed.
And we inquire:
Granted, according to the one who says “
coals
“glowing are forbidden,”
Rabbi properly forbade the bread baked upon them,
because there is benefit of the wood in the bread!
For they are still wood, and not ashes.
But according to the one who says
“even glowing are permitted,” the bread that he forbade
at the outset because
“there is benefit of the wood in the bread”—according to Rabbi, how can you find this?
But they are not wood; they are merely ashes.
Rav Pappa said:
You find it
when
the burning wood is still present and has not yet become coals. And
a flame
comes out from them
opposite it
(opposite the bread), and it bakes it .