God calls Joshua and all Israel to be wholeheartedly committed to him as they enter the land, that they may experience all the blessings of peace and rest in this new land.
The Book of Leviticus is the first that Orthodox Jews teach their children. They do this to teach them about their uncleanness before God because of their sin. Leviticus explains how the Jews could approach a Holy God, a shadow of the work that Jesus would do upon the cross.