These two verses show how much God valued that covenant made with Levi, and how much good it did when it was implemented faithfully. It brought life and peace to the people, and was a wonderful training full of deeply instructive symbols and pictures of the work of Christ.
We might apply this to the teaching by godly parents of their yet unconverted children. The godly standards that they train them in will have a very beneficial effect in keeping them from going into the depths of Satan. Otherwise those children will be so much harder in their attitude to the gospel.