Hebrews 3 discusses the greatness and faithfulness of Jesus Christ compared to Moses. The writer reminds the readers of the Israelites' unbelief and disobedience towards God in the wilderness, and encourages the readers to hold fast to their faith in Christ and not harden their hearts as the Israelites did. The writer also reminds the readers that they share in Christ's calling and that he is the apostle and high priest of their confession. They are encouraged to persevere in their faith until the end, just as Christ did.