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Chapter 7, Mishna 2
What happens when the Paschal lamb comes into contact with the side of a hot oven? Or a prohibited food, either because it is consecrated or non-kosher? A general principal of food-intermingling that can render permitted foods prohibited is that heat is required to cause a status change in the food. When cold foods touch each other, we can just wipe away the prohibited substance. When hot foods touch each other, they change each other. So what if a hot food touches a cold food?