Reference for Eruvin 204:18
אלא לא קשיא הא רבי יהודה והא רבנן
- This is no difficulty, since the latter represents the view of the Rabbis whereas the former represents that of R'Eliezer. According to R'Eliezer who holds that the preliminary requirements of a precept<span class="x" onmousemove="('comment',' Such as the chopping of wood and the burning of charcoal for the purpose of preparing a knife for the performance of the precept of circumcision (cf. Shab. 130a) .');"><sup>57</sup></span> supersede the Sabbath one may tie the string;<span class="x" onmousemove="('comment',' Lit., , ties it since the repair of the string of a musical instrument in the Temple is a preliminary requisite of the precept of the sacrifices which could not be offered in the absence of the Instrumental music of the Levites.');"><sup>58</sup></span> while according to the Rabbis who ruled that they did not supersede it one may only secure it with a loop.