Reference for Pesachim 35:13
ואימא כי לא מטמאו משקין הבאין מחמת כלי אבל משקין הבאין מחמת שרץ ה"נ דמטמאו משקין הבאין מחמת שרץ מי כתיבי
then let it [the Torah] combine them and write them [together]. All food therein which may be eaten, that on which water cometh, and all drink that may be drunk in every such vessel shall be unclean: what is the purpose of 'shall be unclean' twice? Hence 'shall be unclean' of the first part is in respect of defiling liquids. [while] 'shall be unclean' of the second part is in respect of defiling eatables. Y perhaps it is in respect of defiling vessels?<span class="x" onmousemove="('comment',' Sc. the second 'shall be unclean' - why then does R. Jose rule that it is clean in respect of vessels?');"><sup>15</sup></span> - Does it [the reverse] not follow a minori: if a utensil, which defiles liquids, cannot defile [another] utensil,<span class="x" onmousemove="('comment',' As shown infra.');"><sup>16</sup></span> then how much the more should liquids which are unclean<span class="x" onmousemove="('comment',' Lit., 'come'.');"><sup>17</sup></span> through a utensil not defile utensils! Yet perhaps, they do<span class="x" onmousemove="('comment',' Lit., 'when do they not.');"><sup>18</sup></span> not defile [utensils] [when they are] liquids unclean through a utensil; but liquids which are unclean through a sherez, do indeed defile [utensils]? - Are then liquids which are unclean through a sherez, written [in Scripture]?