How do we know heaven is real according to the Bible?

The reality of heaven is firmly established in Scripture, particularly through the words of Jesus in John 14:2-3, where He speaks of His Father's house having many mansions and promises to prepare a place for believers. This reassurance is underpinned by the biblical understanding of God’s faithfulness in keeping His word. Furthermore, the Apostle Paul emphasizes the certainty of this hope in 2 Corinthians 5, where he discusses being present with the Lord after death. Such assurances illustrate that heaven is not merely a concept, but a promised reality for those who believe in Christ, thus giving the faithful a profound sense of hope and anticipation.