Midrash for Bekhorot 71:36
אנן משמיה דר' אילעא מתנינן לה
There [we are witnesses that] there certainly was water [on the way of Nehar pekod], but here, [in connection with the firstling], is it certain that he caused the blemish?
Sifrei Devarim
(Devarim 15:20) "And if there be in it a blemish": This tells me only of an animal that was born unblemished and became blemished. Whence do I derive (the same for) one that was born blemished! From "every blemish."
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