Commentary for Shabbat 51:9

תניא רבי שמעון בן אלעזר אומר כל היוצא מן העץ אין בו משום שלש על שלש ומסככין בו חוץ מפשתן אמר אביי

R. Simeon Shezuri<span class="x" onmousemove="('comment',' Of Shezor, supposed to be Sheghor, near Kefar Anan in Galilee, v. Neub., Geogr., p. 278. ');">¹⁵</span> said: One may kindle with oil of gourds and with naphtha. Symmachos said: All that which comes from flesh, we may not kindle therewith, except fish oil. But Symmachos is identical with the earlier Tanna?<span class="x" onmousemove="('comment',' Sc. R. Johanan b. Nuri. ');">¹⁶</span> — They differ in respect to R. Beruna's dictum in Rab's name,<span class="x" onmousemove="('comment',' V. supra 11a. One holds that tallow, being flesh, may not be used at all, even if mixed with oil, thus rejecting the view expressed there, and the other maintains that the mixture is permitted. ');">¹⁷</span> but it is not clearly defined.<span class="x" onmousemove="('comment',' Who accepts R. Beruna's dictum and who rejects it. ');">¹⁸</span> It was taught, R. Simeon b. Eleazar said: Whatever comes forth from trees is not subject to the law of three by three fingerbreadths,<span class="x" onmousemove="('comment',' A piece of cloth three fingerbreadths square (or more) is liable to become unclean. R. Simeon b. Eleazar excepts the produce of trees, e.g., cotton cloth. ');">¹⁹</span> and one may cover [a booth] therewith,<span class="x" onmousemove="('comment',' The booth (sukkah), in which one must dwell during the Feast of Tabernacles (Lev. XXIII, 42), must be covered with a material that is not liable to defilement (Suk. 12.b); hence the produce of trees is fit for this purpose. ');">²⁰</span> except flax.<span class="x" onmousemove="('comment',' Even if not made up into a garment and as yet merely spun (v. infra 27b). Though not liable to defilement by reptiles it is subject to the uncleanness of leprosy. ');">²¹</span> Abaye observed,

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