What does Numbers 17:3 mean?

'Take the censers of these men who sinned at the cost of their lives, and hammer them into sheets to cover the altar. They’re holy, because they were offered to the Lord. Let them be a warning to the Israelites.' Numbers 17:3 - Modern Text Bible

(The censers are to be made into a covering for the altar, serving as a permanent reminder of what happened to those who challenged God’s order.)