Gittin 25b (כה:) — the Talmud in English

First tithe. Nine [parts] second tithe,

and he exchanges it [he exchanges the second tithe for coins that he has at home]

he transfers the sanctity of the second tithe to coins that he has at home]

and drinks immediately.

Since there is bereira, and when he separates the tithes, it will become retroactively clear which log-measures were teruma and maaser,

the words of Rabbi Meir.

Rabbi Yehuda, Rabbi Yosei, and Rabbi Shimon prohibit it.

But here the matter concerns one who makes the designation dependent on his own decision, and Rabbi Yehuda held that there is no bereira.

Whereas in a case in which one makes it dependent on

the decision of others, he holds that there is bereira.

As we learned:

One who says to his wife, “This is your get from now, if I die from this illness”—if he dies from that illness, it is a get.

And

what is her status during those days [as long as he has not died]?

as long as he has not died]?

Rabbi Yehuda says: She is like a married woman in every respect.” And

Rabbi Yehuda held that

when he dies [when he dies],

when he dies],

it becomes a get.

Even though, at the time he gave her the get, it was uncertain whether he would live or die, and he made the get dependent on the decision of one whose life and death are in His hands, nevertheless, once he died, we say that it became retroactively clear that from the time of delivery he was destined to die from that illness. The get therefore took effect from that time.

This proves that according to Rabbi Yehuda there is bereira when one makes the matter dependent on the decision of others, and not as Rava said.

Likewise,

Rav Mesharsheya said to Rava: Here

we find the view of

Rabbi Shimon, who holds that when one makes the matter dependent on his own decision there is no bereira, but when he makes it dependent on the decision of others, there is bereira.

And where do we find Rabbi Shimon’s statement?

That when one makes the matter dependent on his own decision there is no bereira—

this is what we said.

That is, the Mishna mentioned above: “One who purchases wine from the Kutim—Rabbi Yehuda and Rabbi Shimon prohibit it.” This proves that there is no bereira.

Conversely,

when one makes the matter dependent on the decision of others, he holds that there is bereira—

as it was taught:

One who says to a woman,

“I am having intercourse with you”

for the sake of betrothal,

“on condition that my father consents”—even if the father did not consent, she is betrothed,

because “a man does not make his intercourse an act of licentiousness,” and he resolved in his heart to betroth her with a full betrothal in any event.

Rabbi Shimon ben Yehuda says in the name of Rabbi Shimon: If the father consented, she is betrothed.