Where did Jesus say he will redeem man back to God?

In John 3:16-17, Jesus points out that he was sent to Earth to sacrifice his life to redeem mankind from death, enabling them to have the chance at everlasting life again. The Apostle Paul later reiterated this same point in Romans 5:18, showing that Jesus' sacrifice would equal out to Adam's death, which doomed mankind in the first place. (Romans 5:12)

(New World Translation of the Holy Scriptures)