(Mishnah): If one is Mudar Hana'ah from his friend, he may not lend to or borrow from him objects or money. He may not sell to him or buy from him.

If Reuven said 'lend to me your cow', and he said 'it is not available', and he said 'Konam my field, that I will never plow it [with your cow] - if Reuven himself normally plows, he is forbidden [to plow his field with it], and everyone is permitted;

If Reuven does not normally plow, he and everyone are forbidden.

(Gemara): [If Reuven does not normally plow, why are others forbidden? The case is,] he said 'Konam my field, that I will never plow it [with your cow]; Konam my field, that it will never be plowed with it.'

(Mishnah): If Ploni was Mudar Hana'ah from his friend, and he has nothing to eat, [the Madir] may go to a grocer and say 'Ploni is Mudar Hana'ah from me. What will I do?'

The grocer supplies Ploni, and takes from [the Madir].

(Gemara): [This is permitted] because [the grocer] cannot force [the Madir] to pay. (The grocer is not his Shali'ach; he himself volunteered to give, just he expects the Madir to pay him back.)

(Mishnah): If he needed to build a house or a fence or to harvest his field, [the Madir] may go to workers and say 'Ploni is Mudar Hana'ah from me. What will I do?'

They do the work with Ploni, and collect their wages from [the Madir].

(Gemara) Question: May [the Madir] say 'one who does (works for the Mudar), he will not lose'?

Answer: We learn from the following. In the days of R. Ami, a fire erupted in a village, and R. Ami announced in the Nochri market 'anyone who does (extinguishes), he will not lose.' (This is not considered Shelichus, so also here it is permitted.)

Rebuttal (R. Eliezer bei R. Yosi, in front of R. Yosi): There was [mortal] danger there! (We cannot learn to a case without danger.)

Rejection (of Rebuttal): If there was danger, R. Ami himself could have extinguished! Was it not taught 'any matter of danger (one must do an Isur for Piku'ach Nefesh), we do not say that it should be done through Nochrim or minors, rather, even the greatest Yisrael'?!

A case occurred in which a fire erupted in the Chatzer of Yosi ben Simai in Sichin. The [Nochri] authorities of Tziporin came to extinguish; he did not let them. He told them "let the Gabai (Hash-m) collect his debt." (I will lose what I deserve to lose.)

Immediately, a cloud came there (rain fell) and extinguished it. On Motza'ei Shabbos, he sent a Sela to everyone [who came to extinguish but consented to refrain] and 50 Dinarim to the officer appointed over them.

(R. Chaninah): He did not need to do so (stop them).

There was a Nochri neighbor of R. Yonah. A fire erupted in R. Yonah's neighborhood [on Shabbos]; the Nochri wanted to extinguish it, and R. Yonah did not let him.

The Nochri told him "you have responsibility for [any losses that will come to] my property!" R. Yonah agreed. The entire area was saved.

[A fire erupted, and] R. Yudan of Kefar Imi spread his garment over a stack, and the fire went away from it.