How do we know that Christians go to heaven after death?

The certainty of heaven for Christians is founded on the redemptive work of Christ, which is articulated in John 14:2-3, where Jesus reassures His followers that He prepares a place for them. This promise is rooted in the believer's relationship with Christ and the grace extended through His sacrifice. The doctrine of eternal security further supports this assurance, whereby God maintains the salvation of those who truly believe (Romans 8:38-39). Additionally, 1 John 5:11-13 clarifies that those who have the Son have life, encapsulating the hope of eternal fellowship with God. Thus, faith in Christ and His promises forms a solid basis for the believer's confidence in their heavenly destination after death.