Midrash for Bekhorot 71:34
התם ודאי איכא מיא התם ודאי שדי ביה מומא חששא הוא ובמקום חששא אמרינן מה לו לשקר
And Abaye explained: We do not apply the principle 'why should he lie' where there are witnesses!<span class="x" onmousemove="('comment',' For we are witnesses that water is there all the time, and similarly here also, since we are witnesses that priests are suspected concerning blemishes, we should not say 'why should he lie'?');"><sup>20</sup></span>
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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