We don’t merely want our children to behave well. We don’t simply want them to memorize Bible verses, learn the right answers, or become respectable members of the church. We want them to know Christ.
When Christ died on the cross, He bore the curse required for our disobedience (cf. Deut. 21:23) so that through faith in Him we can receive the blessings merited by His obedience (cf. 2 Cor. 5:21). It’s for that reason that the Law of Moses was never intended to be a means of justification. But that’s not to say that Mosaic Law was inherently bad. On the contrary, the Law is good—if one uses it lawfully (cf. 1 Tim. 1:8).
Picking up after the death of Moses, Joshua narrates the Israelites’ takeover of Canaan after their forty-year wandering in the wilderness. Through their military campaigns, the Israelites would serve as the instrument of God’s judgment upon the Canaanites for their sins, as well as the demonstration of God’s purposes to give the land to Abraham’s descendants (cf. Deut. 9:4-5).