Reference for Shabbat 56:11
אמר רב יוסף היינו דתנינא ג' על ג' מצומצמות ולא ידענא למאי הלכתא
<b><i>MISHNAH</i></b>. A WICK [MADE] OF A CLOTH WHICH WAS TWISTED BUT NOT SINGED, — R. ELIEZER SAID: IT IS UNCLEAN, AND ONE MAY NOT LIGHT [THE SABBATH LAMP] THEREWITH; R. AKIBA MAINTAINED: IT IS CLEAN, AND ONE MAY LIGHT THEREWITH.<span class="x" onmousemove="('comment',' The reasons are discussed in the Gemara, ');"><sup>19</sup></span> <b><i>GEMARA</i></b>. As for the matter of uncleanness, it is well, [for] they differ in this: R. Eliezer holds that twisting is of no effect, and it remains in its previous condition;<span class="x" onmousemove="('comment',' A rag, being part of a garment, is liable to become unclean, a wick does not become unclean. R. Eliezer holds that mere twisting without singeing-this was done to facilitate the lighting-does not make it a wick, and therefore it is still subject to uncleanness. ');"><sup>20</sup></span>