Rif Pesachim 6b {Pesachim 25b continues ... 26b}

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6b

{Pesachim 25b continues}
Like the one who came before Rava.
He said to him {Rava}: The governor of my town has told me, "Go and kill Ploni, and if not, I will kill you."
He {Rava} said to him: Let him kill you rather than you killing him {=Ploni}. Why does it appear that his {Ploni's} blood is redder. Maybe his {Ploni's} blood is redder.

Mar the son of Rav Ashi found Ravina rubbing his daughter with undeveloped olives of orlah.
He said to him {Ravina}: Say that the Sages spoke {their ruling that anything may be used for a remedy} in time of danger. Would they say the same even when not in time of danger?
He said to him: This inflammatory fever is also like a time of danger.
And some say, so did he say {=answer} him: Am I using it in its normal manner of usage?

Abaye said: All agree by kilaim {=forbidden mixed species} of the vineyard that they administer lashes for them even when not used in their normal manner of usage, for achila {eating} was not written by them.

It was stated {by Amoraim}: Benefit {hanaah} which comes to a man again his will:
Abaye said: It is permitted.
And Rava said: It is forbidden.

Where it was possible {to avoid it} and he intends {its benefit}, all agree that it is forbidden. If it is not possible and he does not intend, all agree that it is permitted. When do they argue? When it is possible but he does not intend. Some say, where it is possible but he does not intend, this is the dispute of Rabbi Shimon and Rabbi Yehuda. According to Rabbi Yehuda, who says that that which is not intended {davar sheAino mitkaven} is forbidden, it is forbidden. According to Rabbi Shimon, who says that that which is not intended it permitted, it is forbidden. When do they argue? Where it is not possible but he intended. Abaye said it is permitted and Rava said that it is forbidden.
And we establish like Rava.

{Pesachim 26b}
"and he may not stoke his oven or pot range with it":
The Sages learnt {in a brayta}: An oven which is stoked with the shells {of nuts} of orlah, or with the stibble of kilayim of the vineyard, if {the oven is} new {in that it had never before been used}, it must be destroyed. If old, it must be allowed to cool. If he baked bread in it, Rabbi says that the bread is forbidden, and the Sages say that that the bread is permitted. If he baked it upon the coals, all agree that the bread is permitted.

But they learnt {in a brayta}: whether {the oven is} new or old, it must be allowed to cool.
This is no contradiction. This {brayta} that learnt that it should be destroyed is Rabbi Eliezer, who holds that if this and that {both a permitted and forbidden source} cause, it is forbidden. And this that they learnt that