How do we know that Christ's sacrifice was for His chosen people?

Throughout the gospel, particularly in passages like John 17 and John 10, Jesus affirms that He has come to lay down His life for His sheep—His chosen ones. The washing of the disciples’ feet is a direct act of service to those given to Him by the Father, pointing to the particularity of His atonement. This notion is further supported by Scripture that asserts God's love is directed not to all indiscriminately but specifically to His elect. Thus, we can confidently claim that Christ’s sacrifice was intentional and specific, fulfilling the divine covenant established before the foundation of the world.