Deuteronomy 12:21

Far off. Hence many conclude, that those who lived near the tabernacle, were bound to bring the animals which they designed for their own use, to be slain there, as they did in the desert. Others suppose that all were under the same predicament, and are hereby authorized to follow the same regulations, and to eat the flesh, whether they be clean or otherwise, provided they abstain from the blood. See Leviticus xvii. 3. (Calmet) --- The custom of bringing the beasts to be slain before the door of the tabernacle, was to be no longer obligatory. (Menochius)