Matthew Poole and continuators on Leviticus 17:5

5 To the end that the children of Israel may bring their sacrifices, which they offer in the open field, even that they may bring them unto the LORD, unto the door of the tabernacle of the congregation unto the priest, and offer them for peace-offerings unto the LORD.

Either 1. the Egyptians and other idolatrous nations, which commonly sacrificed to Idols or Devils in fields or any places: who are not here named but may be designed by the particle they, in way of contempt, as if they were not worthy to be named, as that particle is used, Luk. 14. 24. and 19. 27. Ioh. 7. 11. and 8. 10. Or rather, 2. the Israelites now mentioned, and plainly understood in the following they, who before the building of the Tabernacle, took the same liberty herein which the Gentiles did▪ from which they are now restrained.

He nameth these not exclusively to others, as appears from the reason of the law, and from ver. 8, 9. but especially, because in these the temptation was more common in regard of their frequency, and more powerful, because part of these belonged to the offerer, and the pretence was more plausible, because their sanctity was something of a lower degree than others, these being onely called holy, and allowed in part to the people, when the other are called most holy, and were wholly appropriated either to God, or to the Priests.