Make sure you understand what a יד is in regards to קידושין and נזירות
What is a יד מוכיח and what is a יד שאינו מוכיח ?
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אָמַר שְׁמוּאֵל: בְּקִידּוּשִׁין, נָתַן לָהּ כֶּסֶף וְשָׁוֶה כֶּסֶף וְאָמַר לָהּ: ״הֲרֵי אַתְּ מְקוּדֶּשֶׁת״, ״הֲרֵי אַתְּ מְאוֹרֶסֶת״, ״הֲרֵי אַתְּ (לִי) לְאִינְתּוּ״ – הֲרֵי זוֹ מְקוּדֶּשֶׁת. ״הֲרֵינִי אִישֵּׁךְ״, ״הֲרֵינִי בַּעְלֵיךְ״, ״הֲרֵינִי אֲרוּסֵיךְ״ – אֵין כָּאן בֵּית מֵיחוֹשׁ. וְכֵן בְּגֵירוּשִׁין, נָתַן לָהּ וְאָמַר לָהּ: ״הֲרֵי אַתְּ מְשׁוּלַּחַת״, ״הֲרֵי אַתְּ מְגוֹרֶשֶׁת״, ״הֲרֵי אַתְּ מוּתֶּרֶת לְכׇל אָדָם״ – הֲרֵי זוֹ מְגוֹרֶשֶׁת. ״אֵינִי אִישֵּׁךְ״, ״אֵינִי בַּעְלֵיךְ״, ״אֵינִי אֲרוּסֵיךְ״ – אֵין כָּאן בֵּית מֵיחוֹשׁ. אֲמַר לֵיהּ רַב פָּפָּא לְאַבָּיֵי: לְמֵימְרָא דְּסָבַר שְׁמוּאֵל יָדַיִם שֶׁאֵין מוֹכִיחוֹת, הָוְיָין יָדַיִם? וְהָתְנַן: הָאוֹמֵר ״אֱהֵא״ – הֲרֵי זֶה נָזִיר. וְהָוֵינַן בַּהּ: וְדִילְמָא ״אֱהֵא בְּתַעֲנִית״ קָאָמַר? וְאָמַר שְׁמוּאֵל, וְהוּא שֶׁהָיָה נָזִיר עוֹבֵר לְפָנָיו. טַעְמָא דִּנְזִיר עוֹבֵר לְפָנָיו, הָא לָאו הָכִי – לָא! הָכָא בְּמַאי עָסְקִינַן, דְּאָמַר ״לִי״. אִי הָכִי, מַאי קָמַשְׁמַע לַן? הָנֵי לִישָּׁנֵי בָּתְרָאֵי קָא מַשְׁמַע לַן: הָכָא כְּתִיב ״כִּי יִקַּח״ – וְלֹא שֶׁיַּקַּח אֶת עַצְמוֹ. וְהָכָא כְּתִיב ״וְשִׁלְּחָהּ״ – וְלֹא שֶׁיְּשַׁלַּח אֶת עַצְמוֹ.
The Gemara continues to discuss the language of betrothal. Shmuel says: With regard to betrothal, if he gave her money or an item worth money, and said to her: You are hereby betrothed [mekuddeshet], or: You are hereby betrothed [me’oreset], or: You are hereby as a wife, then she is betrothed. If he said: I am hereby your man, or: I am hereby your husband, or: I am hereby your betrothed, then there is no room for concern here. In these cases there is no possibility that it might be a valid betrothal, as betrothal is effective only if its formulation defines the relationship in terms of the woman’s connection to the man, not the reverse. And similarly, with regard to divorce, if a husband gave his wife a bill of divorce and said to her: You are hereby sent away, or: You are hereby divorced, or: You are hereby permitted to marry any man, then she is divorced. If he said: I am not your man, or: I am not your husband, or: I am not your betrothed, then there is no room for concern, as a bill of divorce is effective only if its formulation defines the relationship in terms of the woman’s connection to the man, not the reverse. Rav Pappa said to Abaye: Is this to say that Shmuel holds that ambiguous intimations, i.e., incomplete expressions that can be understood only from their context, are considered like unambiguous intimations? In the cases listed by Shmuel, the woman is betrothed despite the fact that the man did not say: You are hereby betrothed to me, but merely: You are hereby betrothed. The statement itself does not include the detail that the speaker intends to betroth her to himself, and yet Shmuel maintains that the betrothal is valid. Rav Pappa asks: But didn’t we learn in a mishna (Nazir 2a) that one who says: I shall be, is a nazirite? And we discussed this ruling: But perhaps he meant to say: I will be in a fast? And Shmuel said that this mishna is referring to a particular set of circumstances, that he said: I shall be, when a nazirite was passing before him. In that context it is clear the individual meant that he too will be a nazirite. Rav Pappa analyzes this statement: The reason that he is a nazirite is only due to the fact that a nazirite passes before him. But if this were not the case, no, his statement would not be considered a naziriteship vow. This indicates that according to Shmuel, ambiguous intimations are not considered like unambiguous intimations. The Gemara rejects this: With what are we dealing here? Shmuel is referring to a case where he said the formulation and added the phrase: To me. For example, he said to a woman: You are hereby betrothed to me. The Gemara asks: If so, what is Shmuel teaching us? If the man stated the full formula it is obvious that she is betrothed, as he used the standard expression of betrothal. The Gemara answers: These last expressions are what he teaches us. The novelty of Shmuel’s statement is that with regard to the second set of pronouncements there is no concern at all that a valid betrothal or divorce might have been performed. The Gemara explains why according to Shmuel these pronouncements are not of concern. Here, in the case of betrothal, it is written: “When a man takes a woman” (Deuteronomy 24:1), which indicates that the man is acting to change the status of the woman, and it is not written that he takes himself or gives himself to her, as in the case of one who says: I am hereby your man. And likewise, it is written here, with regard to divorce: “And sends her” (Deuteronomy 24:1), and it is not written that he sends himself from her