Reference for Pesachim 31:16
ותלושין מי מכשירין והאמר ר' יוסי בר' חנינא משקי בית מטבחיא לא דיין שהן דכן אלא שאין מכשירין
It makes [solids] fit'; this you know from the beginning of the verse: All food which may be eaten [that on which water cometh, shall be unclean]? - one refers to detached [liquid], and the other to attached [liquid],<span class="x" onmousemove="('comment',' If rain falls upon produce it renders it susceptible to defilement only if the owner of the produce desired it to fall upon something. E.g., if he put out a basin so that the rain should wash it, and subsequently produce fell into the water, it is henceforth susceptible. We are informed here that whether the water is detached from the soil, i.e., whether the rain falls into something detached from the soil, e.g., a bath (as denoted by the words 'in any vessel') , or into something attached, i.e., forming part of the soil, e.g., a pit,and then eatables receive moisture from that rain, they are now ready to be defiled. In the latter case the produce is rendered susceptible only if it comes into contact with the water with the owner's rafv ihbgk desire; in the former, even against the owner's desire. V. Hul. ');"><sup>19</sup></span> and both are necessary: for if we were informed of detached, that is because he [the owner of the eatables] assigned importance to them;<span class="x" onmousemove="('comment',' By the mere fact that he desired that the water should fall there or by pouring it into the vessel.');"><sup>20</sup></span>