Rif Eruvin 26b {Eruvin 81b - 82a}

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26b

{Eruvin 81b}
And they agree in the case of {the man giving his money to} any other man {among his neighbors}, that his money acquired for him. For one may make an eruv for a man only with his consent.

Rabbi Yehuda said: To what does this apply? To eruv of techum but eruv of courtyards may be made with his consent or without his consent, because one may act to benefit a person in his absence, but one may not act to a man's detriment in his absence {and here by eruv of courtyards it is straightforward benefit}.

Gemara:
"A man may give a ma'ah...And they agree in the case of {the man giving his money to} any other man that his money acquired for him":
What is meant by "any other man?"
Rav said: A householder. And so did Shmuel say: A householder.
For Shmuel said: They only said thay his money did not acquire for him from the baker, but for a{nother} householder {who does not regularly sell bread and thus understands he is being made an agent} he acquired. And by a baker, this is only when he said "acquire for me," but if he told him "Prepare an eruv for me," he acquired. And they only said that {when he said} "acquire for me" he does not acquire {through a baker} when he gave him a ma'ah. But if he gave him a vessel, he acquired.

"Rabbi Yehuda said: To what does this apply? To eruv of techum...":
Rav Yehuda cited Shmuel: The halacha is like Rabbi Yehuda. And what is more, in all places Rabbi Yehuda taught a law concerning eruv the halacha is like him.
Rav Chana of Baghdad said to Rav Yehuda: Did Shmuel say this even by an alleyway whose lechi or korah was removed {on Shabbat, where Rabbi Yehuda maintains that the alleyway remains permitted throughout Shabbat}?
He said to him: By eruv I said to you - and not be mechitzot {partitions}.

{Eruvin 82a}
Rabbi Yehoshua ben Levi said: Whenever Rabbi Yehuda taught {the words} אימתי {="when"} or במה {="in what," such as this case}, he is only explaining the words of the Sages.
And Rabbi Yochanan said: אימתי, he comes to explain, and במה, he comes to dispute.

END PEREK SEVEN - chalon