If you confess with your mouth Jesus as Lord, and believe in your heart that God raised Him from the dead, you will be saved.
Romans 10:9
Whoever believes in Him shall not perish, but have eternal life. This can be the simplest part to follow but the hardest part to understand. All we have to do to be assured of life after death in a perfect relationship with God is to believe in Jesus. If you acknowledge that Jesus is Lord—that He is the Son of God that He claimed to be who died to pay the debt of our sin—and truly believe that He was raised from the dead . . . you are saved from the penalty of death!
Jesus proved that the power of death could not hold Him. If we believe in Him, His power over death extends to us as well.