Tevul Yom 2:4-5

T’vul Yom 2:4

Let’s say that a stew and the batter cake on it were chulin (i.e., unsanctified food) and the oil floating on top was trumah. If a t’vul yom touched the oil, he only invalidates the oil. If he mixes it, then wherever the oil goes is invalidated.

T’vul Yom 2:5

Let’s say there was sanctified meat over which a layer of jelly congealed. If a t’vul yom touches the jelly, the pieces of meat remain permitted; if he touches a piece of meat, it and the jelly that comes up with it are considered connected to one another. Rabbi Yochanan ben Nuri says they’re considered connected regardless of which one he touches. The same is true with beans that form a layer over pieces of bread. As far as beans cooked in a pot, when they’re still separate, they’re not considered connected but when they form a solid mass, they are. If they form several such masses, they must be counted (to see which is rendered a first, second or third degree of impurity). If oil is floating on wine and a t’vul yom touches the oil, only the oil is invalidated, though Rabbi Yochanan ben Nuri says that each is considered connected to the other.