Leviticus 11:39

“And if any beast of which ye may eat die, etc.] Any clean beast, as the ox, sheep, goat, deer, etc. what, if rightly killed, is very lawful to eat of; but if it died of itself through any distemper, or was torn by the wild beasts, so the Targum of Jonathan: he that toucheth the carcass thereof shall be unclean until the even; not the bones, nerves, horns, hoofs, or skin, as Jarchi observes; these might be handled, because some of them, at least, were wrought up into one instrument or another, by artificers, for use and service, but the flesh of them might not be touched; whoever did touch it was ceremonially unclean, and might not go into the sanctuary, or have conversation with men, until…”

“If any beast die - Either of itself, or being killed by some wild beast, in which cases the blood was not poured forth, as it was when they were killed by men either for food or sacrifice. Leviticus 11:40”

“11:39-40 Israelites were not to consume blood (7:26). They could eat an animal only after the blood had been drained and properly disposed of (17:13). The undrained blood of an otherwise clean animal that died of natural causes rendered it unclean. An Israelite was permitted to give or sell such an animal to foreigners (Deut 14:21) but not to eat it.”

“Lev 11:24, Lev 11:28, Lev 11:31, Lev 11:40, Lev 15:5, Lev 15:7; Num 19:11, Num 19:16 Leviticus 11:40”

“Lastly, contact with edible animals, if they had not been slaughtered, but had died a natural death, and had become carrion in consequence, is also said to defile (cf. Lev 11:39, Lev 11:40 with Lev 11:24-28). This was the case, too, with the eating of the swarming land animals, whether they went upon the belly, (Note: The large ו in גּחון ( Lev 11:42) shows that this vav is the middle letter of the Pentateuch.) as snakes and worms, or upon four feet, as rats, mice, weasels, etc., or upon many feet, like the insects ( Lev 11:41-43). Lastly ( Lev 11:44, Lev 11:45), the whole law is enforced by an appeal to the calling of the Israelites, as a holy nation, to be holy as Jehovah their God, who…”