What does the Bible say about death and believers?

According to Hebrews 9:27, it is appointed for men to die once, but for believers, this death is not the end. Instead, it marks the beginning of eternal life with God. In 1 Thessalonians 4:13, Paul addresses believers concerning those who have died, encouraging them that they should not mourn as those without hope. The death of a believer is seen as a 'crowning' moment that leads to a fuller communion with Christ, as they enter into eternal rest and rejoice free from earthly suffering and sin.