Christ blessing the supper at Emmaus Painting by Caravaggio National Gallery, London
The Resurrection Proof Of Christ's Victory
The proof of Christ's victory over sin, death and Satan was his resurrection three days after being crucified, as he had promised and Scripture had prophesied.
The Promise of Resurrection Life
Before his ascension and return to heaven, Jesus told his followers to wait in Jerusalem and they would receive the power of the Holy Spirit as proof of his resurrection life in them and the power to take the Good News of the Gospel to the ends of the earth.
In 2 Corinthians 1:22, 2 Corithians 5:5 and Ephesians 1:14 the Apostle Paul says that Jesus' promise of the Holy Spirit to all believers is an arrabon - a Greek word meaning "a guarantee, a deposit or down-payment guaranteeing ownership."
[God anointed us,] set his seal of ownership on us, and put his Spirit in our hearts as a deposit, guaranteeing what is to come. 2 Corinthians 1:22
Now the one who has fashioned us for this very purpose is God, who has given us the Spirit as a deposit, guaranteeing what is to come. 2 Corinthians 5:5
You also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit, who is a deposit guaranteeing our inheritance until the redemption of those who are God's possession—to the praise of his glory. Ephesians 1:13-14
The Born Anothen Experience As Proof Of Resurrection Life
In John 3:3-7 Jesus tells Nicodemus, a religious leader and member of The Sanhedrin, he must be born anothen, meaning both again and from above ie supernaturally.
Jesus' promise of the Holy Spirit to all who put their faith in his death and resurrection is the guarantee we shall be with him when we die.
In 1 Corinthians 15:20-26 Paul describes the reality of resurrection life because Jesus died and rose from the dead.
Christ has indeed been raised from the dead, the firstfruits of those who have fallen asleep. For since death came through a man, the resurrection of the dead comes also through a man. For as in Adam all die, so in Christ all will be made alive. But each in turn: Christ, the firstfruits; then, when he comes, those who belong to him. Then the end will come, when he hands over the kingdom to God the Father after he has destroyed all dominion, authority and power. For he must reign until he has put all his enemies under his feet. The last enemy to be destroyed is death.
That's the best news any of us could wish for!