What does the Bible say about Jesus' atonement?

The Scriptures, particularly in Luke 18:31, indicate that Jesus proactively announces His impending death and resurrection as part of God's sovereign plan. This was not merely a prediction but a divine declaration of what must happen for our restoration. For instance, in John 19:30, when Jesus proclaims 'It is finished,' He confirms that the atonement is complete and sufficient to satisfy God's justice on behalf of the elect. This perfect sacrifice was foreordained by God since before the foundation of the world (Ephesians 1:4-5) and illustrates the assurance we have in His saving work.