Matthew 5 is a chapter in the Bible that contains the Sermon on the Mount, which is a collection of teachings and sayings of Jesus. In this chapter, Jesus discusses a range of topics such as the Beatitudes, fulfilling the law, anger and reconciliation, adultery and divorce, oaths, loving one's enemies, giving to the needy, prayer and fasting, and the importance of storing up treasures in heaven. The chapter is known for its emphasis on ethical and spiritual principles that challenge traditional attitudes and behaviors.