Rif Eruvin 9b {Eruvin 38a continues ... 38b}

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9b
{Eruvin 38a continues}
and on the first I am like the inhabitants of my city.
And the Sages say: Either he makes an eruv for one direction, or he does not make an eruv at all; either he makes an eruv for two days, or he does not make an eruv at all.

How does he make {an eruv for the two days}? He takes it for the first and he waits for nightfall, and he takes it and he comes {to a second location}. On the second he waits until nightfall and he eats it. And thus he benefits by his walking and he benefits from his eruv.
If it was eaten on the first, his eruv is for the first but it is not an eruv for the second.
Rabbi Eliezer said to them: You agree with me that they are two sanctities.

Gemara:
{In the Sages statement in the Mishna:} "To one direction" - what is it? It means {to one direction} for the two days. "For two days" - what is it? It means in one direction! Thus they are one statement! {Why separate it into two?}
This is what the Sages said to Rabbi Eliezer: Do you not admit that we may not make an eruv one one day, half to the north and half to the south?
He said to them: Truth {you are right}.
{They said to him:} Just as we may not make an eruv one one day, half to the north and half to the south, so too we may not make an eruv for two days, one to the east and one to west.
And Rabbi Eliezer: There {on a single day} is is one kedusha; here {on two days}, there are two kedushot.

Rabbi Eliezer said to them: Do you not admit to me that if he made an eruv with his legs¹ on the first day that he must make an eruv with his legs on the second day {and not rely on the first one}? And that if his eruv is consumed on the first day, it is not effective on the second day?
They said to him: Truth!
{He then said:} Thus there are two kedushot.
And the Sages {are actually in doubt whether there is one or two kedushot}: here stringently and here stringently.

They said to Rabbi Eliezer: Do you not admit that we cannot make an eruv in the first place from Yom Tov to Shabbat {if we made no eruv before the onset of Yom Tov}?
He said to them: Truth!
{They said:} Thus, there is a single kedusha!
And Rabbi Eliezer: There, it is because of hachana².

{Eruvin 38b}
Rav said: The halacha is like the four elders, and according to Rabbi Eliezer, who said that there are two kedushot.
And does Rav indeed say this? But it was stated {by Amoraim}: Shabbat and Yom Tov - [Rav said:] if it was born on this day, it is forbidden on that day.
Abaye said: There, it is because of hachana².
What is meant by hachana? As we learnt {in the brayta}: {Shemot 16:5}:

ה וְהָיָה בַּיּוֹם הַשִּׁשִּׁי, וְהֵכִינוּ אֵת אֲשֶׁר-יָבִיאוּ; וְהָיָה מִשְׁנֶה, עַל אֲשֶׁר-יִלְקְטוּ יוֹם יוֹם.

5 And it shall come to pass on the sixth day that they shall prepare that which they bring in, and it shall be twice as much as they gather daily.'

A weekday may prepare for Shabbat and a weekday may prepare for Yom Tov, but Shabbat may not prepare for Yom Tov and Yom Tov may not prepare for Shabbat.

But this that we learn in the Mishna - "How does he make {an eruv for the two days}? He takes it for the first and he waits for nightfall, and he takes it and he comes {to a second location}. On the second he waits until nightfall and he eats it" - he is preparing from Yom Tov to Shabbat?!
He said to him: Do you think that the end of the day the eruv takes effect? At the beginning of the day the eruv takes effect! And {thus} Shabbat prepares for herself.
But now, he should be able to make an eruv with lagin³?
We need a meal which is fit while it is yet day, and this is absent.

But what of this that we learnt in the Mishna - Rabbi Eliezer says: a Yom Tov juxtaposed to Shabbat, whether before or after

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Footnotes:
1: Rashi: Where he did not have bread to send as an eruv and so he walked to the end of 200 0 cubits and established his Shabbat rest in that place.
2: that one may not prepare from one to the next
3: In which wine is taken from a cask and it is tevel, and he says it is teruma once night falls - if he would say that his eruv should be from it, his eruv is no eruv.