ד פשוטיהן מיהא ליטמא דהא פשוטי כלי מתכות דאורייתא נינהו עבדי בהו רבנן הכירא כי היכי דלא לשרוף עלייהו תרומה וקדשים
4 If so, let them revert to their former uncleanness, like metal utensils? For we learnt: Metal vessels, both flat and hollow,<span class="x" onmousemove="('comment',' Lit., 'those of them which receive'. ');"><sup>10</sup></span> are subject to defilement. If broken, they become clean; if remade into utensils, they revert to their former uncleanness. Whereas in respect to glass vessels we learnt: Wooden, skin, bone and glass utensils, if flat, they are clean;<span class="x" onmousemove="('comment',' I.e., they cannot be defiled. ');"><sup>11</sup></span> if hollow, they are unclean;<span class="x" onmousemove="('comment',' As in n. 7. ');"><sup>12</sup></span> if broken, they become clean; if remade into vessels, they are liable to defilement from then onwards. [Thus] only from then onwards, but not retrospectively? — The uncleanness of glass utensils is Rabbinical, and [the resuscitation of] former uncleanness is [also] Rabbinical: now, in the case of that which is unclean by Scriptural law, the Rabbis have imposed [retrospective] uncleanness upon it, but upon that which is unclean by Rabbinical law the Rabbis have imposed no [retrospective] uncleanness. Yet at least let their flat utensils be unclean, since flat metal utensils are [susceptible to uncleanness] by Scriptural law!-The Rabbis made a distinction in their case, so that <i>terumah</i> and sacred food should not be burnt on their account.<span class="x" onmousemove="('comment',' For these must not be burnt when defiled by Rabbinical law, except in the six cases of doubtful uncleanness enumerated on 15b. ');"><sup>13</sup></span>