Jesus was faithful to God just as Moses was faithful to God. Moses was faithful in God’s house as a servant but Jesus was faithful as a Son—the Inheritor.
The Pauline Author gives the example of the Israelites’ refusal to trust God. Their lack of faith resulted in them wandering in the wilderness for 40 years and losing the chance to possess the land that God had promised them.
The Pauline Author continues warning these believers to not turn away from God. He asks them to encourage one another and turn from sin.
The Israelites turned from God, and because of their unbelief, they did not receive their inheritance.
In chapter 3, Paul lays out a warning to these Jewish believers: We can lose the reward of our inheritance in Christ if we lose our hope and harden our hearts. Paul uses the Israelites as an example of a people who hardened their hearts against God and against repentance, and as a result, that generation did not receive the inheritance of the promised land.