Leviticus 10:10 You are to distinguish between the holy and the common, and between the unclean and the clean.
The Book of Leviticus starts by covering rules. There are pretty much rules for just about everything. These rules are for the Levites most of all. The Levites provided the priests for the Israelites. They are descendants of the tribe of Levi.
Just before this verse, the sons of Aaron (brother of Moses) offered a ‘strange fire’ to the Lord. I’m not sure exactly what that means, but it was something that they sure were not authorized to do. They end up being consumed by a fire sent from God.
A few verses later the Lord tells Aaron that he and his sons are not to drink fermented drink in the tent of meeting. (Does that mean that Aaron’s sons were drunk while trying to carry out their priestly duties?) Is it possible that being under the influence kept them from distinguishing between right and wrong?
Offering up a strange fire ends up causing Aaron’s sons not to be able to distinguish between what is holy and what isn’t. They lost sight of what is good and bad. Likewise, when we drift from God, what we have to offer becomes strange to God’s Word. The lines between holy and common, clean and unclean, good and bad, right and wrong become blurred. It happened with Aaron’s sons. It is happening right now in the world around us. I think that it wouldn’t hurt for me to take a look at my own life to see if I too have failed to distinguish those lines.