Nazir 50B

בית שמאי אומרים: אף המקפה של גריסין ושל פול, מפני שהיא סולדת לאחוריה.

Beit Shammai say: Even the stream of a stew made of crushed and broken beans or of whole beans also connects two items because it returns backward. When one stops pouring this stew, part of the dish reverts to its place of origin, and therefore the stream is considered a single unit.

בעי רמי בר חמא: יש נצוק לאוכלין, או אין נצוק לאוכלין. מי אמרינן משום דאית בהו רירי, והני לית בהו רירי. או דלמא משום דסמיכין הוא, והכא הא סמיכין?

§ Rami bar Ḥama raises a dilemma: According to the opinion of the Rabbis that in general, poured liquid does not serve to connect, is there a stream for food, or is there not a stream for food? If one pours melted food into an impure vessel, does the food which one is pouring become impure? The Talmud explains the two sides of the dilemma: Do we say that zifim honey and batter connect different items because they have a flow that returns backward, and these regular foods do not have a flow that returns backward? Or, perhaps the reason why zifim honey and batter connect is because they are viscous, and here the melted foodstuffs are also viscous.

אמר רבא, תא שמע: חלב המת שהוא שלם והתיכו ⁠— טמא, היה מפורד והתיכו ⁠— טהור. ואי סלקא דעתך אין נצוק לאוכלין, שלם והתיכו נמי ליטהר!

Rava said: Come and hear a resolution from the Tosefta (Oholot 4:3): If there was fat of a corpse that was whole and contained an olive-bulk, and one melted it, it is ritually impure. If from the outset the fat was separated into pieces smaller than an olive-bulk, which do not impart impurity, and one melted it, so that it combined into an olive-bulk in its melted state, it is pure. And if it enters your mind that there is no stream for food, even if it was whole and one melted it, it should also be pure, as it became liquid and spread throughout the pan. Consequently, each part should be considered separate, which means the food is not the size of an olive-bulk.