Let it run down and become unclean, but he must not render it unclean with his own hands; and R. Joshua says, He may even render it unclean with his own hands! — In that case it is different, since in any event it will become unclean. When R. Isaac came [from Palestine] he recited: If the lambs of Pentecost were slaughtered not according to the prescribed rite, they are invalid; their appearance must be spoilt and they must be taken away to the place of burning. R. Nahman said to him, You, Master, who compare [the lambs of Pentecost] with the sin-offering recite that they are invalid, but a Tanna of the School of Levi who infers obligatory peace-offerings from freewill peace-offerings recites that they are valid. For Levi taught: And so with the peace-offerings of a Nazirite, if they were slaughtered not according to the prescribed rite, they are valid but they do not count in fulfilment of their owner's obligation; they may be eaten the same day and evening [until midnight], and they do not require any cakes nor the offering of the shoulder [to the priest]. An objection was raised: If for the guilt-offering that requires a lamb of the first year a sheep of the second year was offered, or for that which requires a sheep of the second year a lamb of the first year was offered,it is invalid; its appearance must be spoilt and it must be taken away to the place of burning. But if the burnt-offering of the Nazirite, or of a woman after childbirth, or of a leper, was a sheep of the second year and it was slaughtered, it is valid. This is the general principle: Whatsoever is valid for a freewill burnt-offering is also valid for an obligatory burnt-offering, and whatsoever is invalid for a sin-offering is also invalid for a guilt-offering except [when the offering was slaughtered] under another name! — The author of this Baraitha is the Tanna of the School of Levi. Come and hear from the following which Levi taught: If the guilt-offering of the Nazirite and the guilt-offering of the leper were slaughtered under another name, they are valid, but they do not count in fulfilment of the owner's obligation. If they were slaughtered before the time had arrived for the owner to offer them, or if they were of the second year, they are invalid. Now if this were so, he should then draw an inference from the peace-offering! — He infers peace-offering from peace-offering but he does not infer guilt-offering from peace-offering. But then if he infers peace-offering from peace-offering he should also infer guilt-offering from guilt-offering, viz., the guilt-offering of the Nazirite and of the leper from the guilt-offering for robbery and for sacrilege, and then the guilt-offering for robbery and for sacrilege from the guilt-offering of the Nazirite and of the leper! — R. Shimi b. Ashi answered, We infer what is offered not according to the prescribed rite from what is similarly offered not according to the prescribed rite, but we do not infer what is offered not according to the prescribed rite from what is offered according to the prescribed rite. Do we not? Surely it has been taught: Whence do we know that if what had been taken out [of its proper place] was later brought up upon the altar it must not come down again? From the fact that with regard to the high places what was taken out was still valid to be offered! —ᵃᵇᶜᵈᵉᶠᵍʰⁱʲᵏˡᵐⁿᵒᵖᵠʳˢᵗᵘ