Reference for Bekhorot 39:16

סימן הוולד בבהמה דקה טינוף ובגסה שליא ובאשה שפיר ושליא

But [what I say is that] wherever it is known that it had given birth, the priest receives nothing; wherever it had never given birth, it belongs to the priest, and if it is a questionable [firstling], it shall be eaten in its blemished state by the owner.

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