Reference for Bekhorot 79:29

לאו מישחט שחטיה

But it is not a case here of the prohibition of trefahs! Then [this is what he said to R'Akiba]: How long will you allow Israel to eat consecrated sacrifices without [the wall of Jerusalem]?<span class="x" onmousemove="('comment',' For it is an unblemished firstling which can only be eaten in Jerusalem and, according to your ruling, it will be eaten outside the walls of Jerusalem.');">¹⁵</span>

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