Reference for Shabbat 41:1

למאי נפקא מינה למקח וממכר:

What is the practical bearing of this? — In respect of buying and selling.<span class="x" onmousemove="('comment',' When one orders 'itrona or wax, he must be supplied with the residue of pitch or honey respectively. ');">¹</span> Our Rabbis taught: All those of which they ruled that you must not light [the Sabbath lamp] therewith on the Sabbath, yet a fire may be made of them, both for warming oneself and for using the light thereof, whether on the earth or on the stove;<span class="x" onmousemove="('comment',' Var. lec.: in the lamp. ');">²</span>

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