What does the Bible say about why Christ had to die on the cross?

According to scripture, particularly John 3:14 and 1 Peter 3:18, Christ's death was essential for several reasons. First, He suffered for the sins of His people, bearing their transgressions as foretold in Isaiah. Second, He, being the just one, died for the unjust, allowing for a just redemption. This divine transaction underscores God's justice being satisfied through Christ’s sacrificial death, ultimately bringing believers closer to God. The necessity of Christ's death is rooted in the concept that sin demands justice, and only through Christ could that justice be fulfilled.