Reference for Chullin 33:5

לא בא הכתוב אלא לאסור להן בשר נחירה שבתחלה הותר להן בשר נחירה משנכנסו לארץ נאסר להן בשר נחירה

For in the beginning the Israelites were permitted to eat the flesh of a stabbed animal,<span class="x" onmousemove="('comment',' , generally denoting stabbing at the throat. In the wilderness the Israelites were permitted to eat the flesh of an animal no matter how it was killed, because the injunction to slaughter according to ritual was not intended to be effective until they had entered the land of Israel.');">³</span>

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