Leviticus 17:3

Whoever of the house of Israel slaughtered an ox, sheep, or goat, either within or outside the camp, without bringing the animal to the tabernacle, to offer a sacrifice therefrom to the Lord, "blood was to be reckoned to him;" that is to say, as the following expression, "he hath shed blood," shows, such slaughtering was to be reckoned as the shedding of blood, or blood-guiltiness, and punished with extermination (see Gen 17:14). The severity of this prohibition required some explanation, and this is given in the reason assigned in Lev 17:5-7, viz., "that the Israelites may bring their slain-offerings, which they slay in the open field, before the door of the tabernacle, as peace-offerings to Jehovah," and "no more offer their sacrifices to the שׂעירים, after whom they go a whoring" (Lev 17:7). This reason presupposes that the custom of dedicating the slain animals as sacrifices to some deity, to which a portion of them was offered, was then widely spread among the Israelites. It had probably been adopted from the Egyptians; though this is not expressly stated by ancient writers: Herodotus (i. 132) and Strabo (xv. 732) simply mentioning it as a Persian custom, whilst the law book of Manu ascribes it to the Indians. To root out this idolatrous custom from among the Israelites, they were commanded to slay every animal before the tabernacle, as a sacrificial gift to Jehovah, and to bring the slain-offerings, which they would have slain in the open field, to the priest at the tabernacle, as shelamim (praise-offerings and thank-offerings), that he might sprinkle the blood upon the altar, and burn the fat as a sweet-smelling savour for Jehovah (see Lev 3:2-5). "The face of the field" (Lev 17:5, as in Lev 14:7, Lev 14:53): the open field, in distinction from the enclosed space…

After the law concerning the atonement to be made for all Israel by the high priest, at the tabernacle, with the blood of bulls and goats, in this chapter we have two prohibitions necessary for the preservation of the honour of that atonement. I. That no sacrifice should be offered by any other than the priests, nor any where but at the door of the tabernacle, and this upon pain of death (Lev 17:1-9). II. That no blood should be eaten, and this under the same penalty (Lev 17:10, etc.).

17:3-9 These regulations (see also Deut 12:15-21) indicate that unsupervised sacrifice could easily lead to the integration of pagan elements into the true worship of the Lord (Lev 17:7). Israel was camped around the Tabernacle (Num 2:2-34), so it was not inconvenient to bring an animal to the sanctuary for slaughter. Deuteronomy 12:20-24 anticipates Israel’s settlement in the land and the hardship imposed by this regulation. It permitted slaughtering and eating meat without bringing it to the sanctuary, as long as the blood was not consumed.