What does the Bible say about the significance of building an altar?

The act of building an altar conveys the fundamental principle that there is no worship or approach to God without sacrifice. This truth is evident from the actions of biblical figures such as Noah and Abraham, who, upon receiving blessings or deliverance, responded by building altars to the Lord. Ezra's return from Babylon and the first action of constructing an altar demonstrates the prioritization of worship and acknowledgment of God's holiness and the necessity of atonement. Ultimately, these altars foreshadow the ultimate sacrifice of Christ, who fulfills the role of altar, priest, and sacrifice.