Yoma 64a-64b
Is the he-goat that is pushed off the precipice considered slaughtered? \u2022 Once living creatures are temporarily unfit for sacrificial service, can they ever be reinstated? \u2022 How can the offering of sacrificial limbs from a blemished animal ever be pleasing before God? \u2022 Can tzitzis that weren't made lishmah (with the requisite intentionality) be nullified and rendered kosher if lost in a larger group of kosher tzitzis?