Why did the Sages see a need of inventing a new word "Kiddushin" e.g Masechet Kiddushin 46a - שצריכה הימנו קידושין , instead of the biblical Hebrew word "Erusin" used everywhere in the Torah, as in:

"וּמִי־הָאִישׁ אֲשֶׁר־אֵרַשׂ אִשָּׁה וְלֹא לְקָחָהּ יֵלֵךְ וְיָשֹׁב לְבֵיתוֹ וכו'׃" (Deut 20,7)

"וְאִם־בַּשָּׂדֶה יִמְצָא הָאִישׁ אֶת־הַנַּעֲרָה הַמְאֹרָשָׂה וְהֶחֱזִיק־בָּהּ וכו'׃" ibid 22,25

  1. The נערה מאורשה is forbidden to others Deoraytah so the reason that the Gemara brings (Kiddushin 2,2) is unneeded - there's no Chiddush Derabanan:

"ולבסוף תני לישנא דרבנן... דאסר לה אכולי עלמא כהקדש"

  1. Moreover, in no place the betrothed girl is called subsequently "מקודשת" but "מאורסה" everywhere.

  2. The word "לקדש" is used everywhere (except for קדשה - prostitute) for additional sanctity as in "קדש לי כל בכור" or "זכור את יום השבת לקדשו", or "הקדש". Why use it suddenly for a regular marriage?

So why is the new term?

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    Isn't the answer דאסר לה אכולי עלמא כהקדש? – Salmononius2 Nov 27 '18 at 14:37
  • @Salmononius2 as I said, the reason adds no information to what is already established in the Torah. – Al Berko Nov 27 '18 at 15:04
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    Read Tosefos on Kiddushin the beginning of the 2nd Perek as to why the Tanna uses a loshon of Ish Mekadesh – user18323 Nov 27 '18 at 15:18
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    Is this the only place where Mishnaic Hebrew tends to use a different term? What's the big deal? – Double AA Nov 27 '18 at 16:42
  • @DannyF If you want to make a point please cite the exact source. I've read enough Tosfos and didn't get an answer. – Al Berko Nov 27 '18 at 17:30

Min Hatorah a woman after Eirusin is permitted to have relations with her husband so she is NOT like Hekdesh which is forbidden to everyone.

However there is a Rabbinic enactment that a woman who is an Arusa is forbidden to everyone including her Husband until she enters her husbands Domicile and he makes Birkas Chasanim so now she IS like Hekdesh which everyone is forbidden to have benefit from (Kiddushin 2b)

Kesubos 8a:

מברכין ברכת חתנים בבית חתנים וברכת אירוסין בבית האירוסין ברכת האירוסין מאי מברך רבין בר רב אדא ורבה בר רב אדא תרוייהו משמיה דרב יהודה אמרי בא"י אמ"ה אשר קדשנו במצותיו וצונו על העריות ואסר לנו את הארוסות והתיר לנו את הנשואות על ידי חופה וקדושין

Rashi explains:ואסר לנו את הארוסות - מדרבנן שגזרו על הייחוד של פנויה ואף ארוסה לא התירו עד שתיכנס לחופה ובברכה כדפרישית כלה בלא ברכה אסורה לבעלה כנדה ואדרבנן נמי מברכין וצונו
Miderabanan the Arusa is forbidden even to her own husband, as well as everyone else Since the Rabbis made a Decree of Yichud also on an Arusa until she enters the husbands domicile and with a Brocha as it says A Kallah without a Brocha is forbidden to her husband like a Nidda.

So the Term Kiddushin comes to automatically include the Rabbinical enactment that the woman is now forbidden to her husband as well as aeveryone else for relations (until she enters her Husbands Domicile and the Brocho is recited)

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  • Some Rishonim disagree and think if the husband sleeps with his Arusa he gets killed, clearly implying the prohibition is biblical – Double AA Feb 4 '19 at 20:51
  • @DoubleAA this would be interesting if you could provide a source – user15464 Feb 4 '19 at 20:59
  • I think it's in the Shittah Mekubbetzet in Ketubbot. – Double AA Feb 4 '19 at 21:18
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    @doubleaa if you mean this Shita mekubetzes in the name of the Rashba :ש"מ דלא קניא לה לגמרי הילכך הויא לה כארוסת אחר לגביה ואסירא ליה כדין אשת איש -she is not fully acquired yet and she is similar to a wife of another and hence prohibited to her husband similar to an Eishes ish. This is all mideranan as the Rashba clearly states in his commentary אף על גב דחופה דאורייתא לענין נדרים ולענין קטלה, מכל מקום לענין התר ביאה מכיון שנתקדשה הרי היא קנוייה לו לבעל ומותרת לו מעתה – yosefkorn Feb 4 '19 at 22:57
  • No that's not it. It's explicit he gets killed – Double AA Feb 4 '19 at 22:58

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