Reference for Chullin 165:17

מ"ט דרבי יהודה כגון דלית ביה כזית דתניא

<big><b>MISHNAH: </b></big>AT FOUR PERIODS IN THE YEAR HE WHO SELLS A BEAST TO ANOTHER MUST INFORM HIM, I SOLD TO-DAY ITS DAM TO BE SLAUGHTERED', OR''I SOLD TO-DAY ITS YOUNG TO BE SLAUGHTERED',<span class="x" onmousemove="('comment',' It is presumed that on these special days animals would be slaughtered on the day that they are bought, so as to have meat prepared for the Festival that is on the following day. This information is necessary in order to avoid the slaughtering of the dam and its young on the same day');">⁸</span>

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