Why should we care about ancient instructions issued to the clans of Levi on how they were to function in a Tabernacle that no longer exists? A vow that can’t be completely fulfilled without the Temple? Judicial processes for jealous husbands that carry no legal weight today?
The Torah reading נָשֹׂא Naso (“carry, take” a census, Num. 4:21-7:89) teaches that part of the “wilderness” believer’s boot camp is to learn to be eager to step up for service.