The consequences of sin are serious, the brutality of sin is serious. Leviticus shows that sin was ugly, weighty, consequential. We would not find it funny, when we lie, steal, or over eat because something was going to die.
If sin were treated like this today, where each person were held reponsible for the taking of life in someway, we would not find sin so inconsequential. We are normalized to sin.
14-16’ The sin that is committed against a brother is also committed against God, so it must be made right with both parties
18’ We are held accountable for the things we do unintentionally,
10 - Nadab and Abihu offer an unauthorized sacrifice before God so He shows them He is serious about their responsibility and God’s fire consumed them. Replaced by Eleazar and Ithmar