Zevachim 91
חוץ מן הדם כו': מנא הני מילי אמר עולא אמר קרא (ויקרא יז, יא) ואני נתתיו לכם שלכם יהא
EXCEPT BLOOD etc. Whence do we know it? - Said 'Ulla, Scripture saith, [For the life of the flesh is in the blood,.] and I have given it to you [upon the altar to make atonement for your souls]: [this teaches,] it is yours. The school of R. Ishmael taught: 'To make atonement' [implies] but not for trespass. R. Johanan said: Scripture saith, it is [which intimates,] it is before atonement as after atonement: as there is no trespass after atonement, so there is no trespass before atonement. Say, it is after atonement as before atonement: as it involves trespass before atonement, so it involves trespass after atonement? - Nothing involves trespass once its function is performed. Does it not? But lo, there are the separated ashes? - That is because the separated ashes and the priestly vestments are [taught in] two texts which come for the same purpose, and wherever two texts come for the same purpose, they do not illumine [other cases]. That is well according to the Rabbis who maintain that, [And Aaron . . . shall put off the linen garments . . . ] and shall leave them there teaches that they must be stored away. But what can be said on the view of R. Dosa, who maintained [that] they are permitted to an ordinary priest, only that he [the High Priest] does not use them on another Day of Atonement? - Because the separated ashes and the beheaded heifer are [taught in] two texts which come for the same purpose, and wherever two texts come for the same purpose, they do not illumine [other cases]. That is well on the view that they do not illumine; but what can be said on the view that they do illumine? - Two limitations are written: here is written, [over the heifer] whose neck was broken; while there it says, [And he shall take up the ashes . . .] and he shall put them [beside the altar]. Now, why do I need three texts in connection with blood? One excludes it from trespass, another from nothar, and a third from defilement. But no text is required for piggul for we learnt: Whatever has mattirin, whether for man or for the altar, involves liability on account of piggul: whereas blood is itself a mattir.