Reference for Shabbat 244:18
קסבר
but as for that of a box, chest, or coffer, what is his opinion? If he holds, [The interdict of] building applies to utensils, then that of demolishing [too] applies to utensils; whilst if there is no [prohibition of] building in respect to utensils, there is no [prohibition of] demolishing in respect to utensils [either]?<span class="x" onmousemove="('comment',' Thus removing and refitting should be the same. ');"><sup>14</sup></span> — Said Abaye: In truth he holds: There is [the prohibition of] building in the case of utensils, and there is [that of] demolishing in respect of utensils, but he means, Those that were removed [may not be replaced].<span class="x" onmousemove="('comment',' Thus only one law is stated; the doors of a chest, box, and coffer, if detached (before the Sabbath), may not be refitted. ');"><sup>15</sup></span> Said Raba to him, There are two objections to this: one, since he teaches that they may be removed; and two, how [explain] 'but not replaced?' — Rather said Raba: He holds, [The interdict of] building does not apply to utensils, and the interdict of demolishing does not 'apply to utensils, yet it is a preventive measure, lest he fix it firmly.<span class="x" onmousemove="('comment',' Nailing or screwing it on, which is certainly labour; hence he must not put it back at all. ');"><sup>16</sup></span> A MAN MAY TAKE A HAMMER, etc. Rab Judah said: [This means,] a nut hammer to split nuts therewith, but not a smith's [hammer]: he holds, An article whose function is a forbidden labour is forbidden [even] when required for itself.<span class="x" onmousemove="('comment',' For a permitted labour. I.e., since the normal function of a smith's hammer is to perform labour forbidden on the Sabbath, it may not be handled even for a permitted purpose. ');"><sup>17</sup></span> Said Rabbah to him: If so, when the second clause teaches, A WINNOWING SHOVEL AND A PITCH-FORK, TO PLACE [FOOD] UPON IT FOR A CHILD, are a winnowing shovel and a pitch-fork set aside specially for a child?<span class="x" onmousemove="('comment',' Surely not! ');"><sup>18</sup></span> Rather said Rabbah: [it means] a smith's hammer to split nuts therewith; he holds,