Raba said: The law is: Leaven, in its time, whether [mixed] with its own kind or with a different kind, is forbidden [even] when there is a minute quantity, in accordance with Rab; when not in its time, whether [mixed] with its own kind or with a different kind, it is permitted, in accordance with R. Simeon. Yet did Raba say thus? Surely Raba said, R. Simeon does indeed penalize him, since he transgressed ‘there shall not be seen’ and ‘there shall not be found’ with it? — That is only in its natural state, but not when it is in a mixture. Now Raba is consistent with his view, For Raba said: When we were at R. Nahman's house, when the seven days of Passover were gone he would say to us, ‘Go out and buy leaven from the troops.’ Rab said: Pots must be broken on Passover. Why so? Let them be kept until after Passover and used with a different kind? — Lest he come to use it with its own kind. But Samuel maintained: They need not be broken, but can be kept until after its period and [then] used with their own kind or with a different kind. Now Samuel is consistent with his view. For Samuel said to the hardware merchants: Charge all equitable price for your pots, for if not I will publicly lecture [that the law is] in accordance with R. Simeon. Then let him lecture [thus] to them [in any case], seeing that Samuel holds as R. Simeon? — It was Rab's town. A certain oven was greased with fat. [Thereupon] Raba b. Ahilai forbade for all time the bread [baked therein] to be eaten even with salt, lest he come to eat it with kutah. An objection is raised: One must not knead dough with milk, and if he does knead it, the whole loaf is forbidden, because it leads to sin. Similarly,ᵃᵇᶜᵈᵉᶠᵍʰⁱʲᵏˡᵐⁿᵒ