How do we know Christ's atonement is for a specific group?

The concept of limited or definite atonement indicates that Christ's sacrificial work on the cross was intended for a specific group of people—those whom God elected for salvation. This is drawn from verses in Isaiah 53 that use pronouns like 'our' and 'we,' indicating a particular people in view. Ephesians 1:4 supports this, stating that God chose His people in Christ before the foundation of the world. Thus, Christ's death was a targeted fulfillment of God's promise to redeem those He has predestined.