Mishnayos Eruvin Perek 10 Mishnah 10
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עירובין פרק י׳ משנה י׳
With regard to a bolt that secures a door in place and that has a thick knob [gelustera] at its end, a useful implement for a variety of purposes, the tanna’im disagree whether the bolt has the status of a vessel, and one may therefore close the door with it, or whether it is considered a cross beam, which would mean that doing so is classified as building. Rabbi Eliezer prohibits its use, and Rabbi Yosei permits it. Rabbi Eliezer said: An incident occurred in a synagogue in Tiberias, where they were accustomed to treat use of this bolt as permitted, until Rabban Gamliel and the Elders came and prohibited it to them. Rabbi Yosei says that the opposite was the case: At first they were accustomed to treat use of this bolt as prohibited, and Rabban Gamliel and the Elders came and permitted it to them.
נֶגֶר שֶׁיֵּשׁ בְּרֹאשׁוֹ גְלֻסְטְרָא, רַבִּי אֱלִיעֶזֶר אוֹסֵר, וְרַבִּי יוֹסֵי מַתִּיר. אָמַר רַבִּי אֱלִיעֶזֶר, מַעֲשֶׂה בַכְּנֶסֶת שֶׁבִּטְבֶרְיָא שֶׁהָיוּ נוֹהֲגִין בּוֹ הֶתֵּר, עַד שֶׁבָּא רַבָּן גַּמְלִיאֵל וְהַזְּקֵנִים וְאָסְרוּ לָהֶן. רַבִּי יוֹסֵי אוֹמֵר, אִסּוּר נָהֲגוּ בָהּ, בָּא רַבָּן גַּמְלִיאֵל וְהַזְּקֵנִים וְהִתִּירוּ לָהֶן:
Bartenura
נגר. כעין בריח שתוחבים בכותלים או באסקופה לנעול בו הדלת:
גלוסטרא. שראשו עבה ועגול כמין רמון ועשוי כבוכנא שראוי לדוך בו פלפלין. ואע״ג דתורת כלי עליו אוסר ר׳ אליעזר אא״כ קשור ותלוי בדלת ור״י מתיר והל׳ כר״י:
נגר – a kind of door-bolt that they insert in the walls or in the lintel to lock the door.
גלוסטרא – that its top is wide and round like a pomegranate and is made like a club (with a handle used as a door-bar – see Talmud Eruvin 102a) that one uses to pound with it peppers, and even though it has the status of a utensil, Rabbi Eliezer forbids it other than it if is attached and hanging on the door. But Rabbi Yosi permits it and the Halakha is according to Rabbi Yosi.