Reference for Bekhorot 115:2

ואע"ג דתנן

And although we have learnt in the Mishnah: UNTIL THE ARRIVAL OF THE TITHING PERIOD IT IS PERMITTED TO SELL AND KILL ANIMAL FOR FOOD,<span class="x" onmousemove="('comment',' We see then that only the arrival of the tithing period causes the animal to be subject to the tithe.');">²</span>

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