Nedarim7: 5
הַנּוֹדֵר מִן ,,הַמִּטָּה” — מֻתָּר בַּדַּרְגָּשׁ; דִּבְרֵי רַבִּי מֵאִיר. וַחֲכָמִים אוֹמְרִים: דַּרְגָּשׁ בִּכְלָל ,,מִטָּה”. הַנּוֹדֵר מִן ,,הַדַּרְגָּשׁ” — מֻתָּר בַּמִּטָּה. הַנּוֹדֵר מִן ,,הָעִיר” — מֻתָּר לִכָּנֵס לִתְחוּמָהּ שֶׁל עִיר, וְאָסוּר לִכָּנֵס לְעִבּוּרָהּ; אֲבָל הַנּוֹדֵר מִן ,,הַבַּיִת” — אָסוּר מִן הָאֲגַף וְלִפְנִים.
One who makes a neder prohibiting a bed is permitted the footstool; [these are] the words of R' Meir. The Sages, however, say: A footstool is included in the [term] bed. One who makes a neder prohibiting a footstool is permitted the bed. One who makes a neder prohibiting a city is permitted to enter the techum of the city, but is forbidden to enter the extension; but one who makes a neder prohibiting a house is forbidden from the doorframe and inward.