Reference for Bekhorot 42:34

אם איתא דלא בכרה כיון דאיכא איסורא אודועי הוה מודע ליה

he did not inform him,<span class="x" onmousemove="('comment',' In four periods of the year. the Mishnah says in Hul. 83b, a seller must inform prospective buyers that he had sold the mother or the young on that day, so as to safeguard the buyer from killing the mother with its young on the same day.');">²⁵</span>

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