What's the difference between accidentally eating something unclean and doing it on purpose? The penalty and cleansing ritual offer a clue.
Leviticus 17:15 makes a distinction in how the law applies, particularly concerning 'a native or a sojourner.' While the core prohibition against eating carcass meat applied to all, the severity of the consequence, and thus the ritual, often hinged on intent.
Accidental vs. Presumptuous Sin
Scholars note that the ritual washing prescribed here – washing clothes, bathing, and remaining unclean until evening – suggests a less severe infraction. This was typically for those who ate such meat through ignorance or inadvertency. Eating it knowingly, however, was a 'presumptuous sin' against God's explicit law, carrying a much heavier spiritual consequence, potentially requiring a different, more significant form of atonement than just ritual cleansing.