Reference for Shabbat 58:6
תניא א"ר יהודה פעם אחת שבתינו בעליית בית נתזה בלוד והביאו לנו שפופרת של ביצה ומלאנוה שמן ונקבנוה והנחנוה על פי הנר והיה שם ר"ט וזקנים ולא אמרו לנו דבר אמרו לו משם ראיה שאני בית נתזה דזריזין הן
BUT IF THE POTTER JOINS IT BEFOREHAND, IT IS PERMITTED, etc. It was taught: if he joins it with plaster or potter's clay, it is permitted. But we learnt, THE POTTER?<span class="x" onmousemove="('comment',' Which implies that it must be professionally done, whereas 'he joins it' denotes an amateur job by the owner. ');"><sup>14</sup></span> — What is meant by POTTER? After the manner of a potter.<span class="x" onmousemove="('comment',' I.e., firmly. ');"><sup>15</sup></span> It was taught, R. Judah said: We were once spending the Sabbath in the upper chamber of Nithzeh's house in Lydda, when an eggshell was brought, which we filled with oil, perforated, and placed over the mouth of the lamp; and though R. Tarfon and the elders were present, they said nothing to us.<span class="x" onmousemove="('comment',' To forbid it. ');"><sup>16</sup></span>