Reference for Chullin 82:31

אשם תלוי בר נידר ונידב הוא

- R'Oshaia answered, It is different with the passover-offering, for it may be set aside for this purpose at any time during the year.<span class="x" onmousemove="('comment',' So that this man may be slaughtering now the animal which he has set apart for his paschal-offering, obviously not as the Passover-offering but as a peace-offering. And since it is being slaughtered outside the sanctuary the onlooker would receive a wrong impression.');">¹²</span>

Jastrow