How do we know Christ was foreordained as the Lamb?

1 Peter 1:20 explicitly states that Christ was foreordained as the Lamb before the foundation of the world, affirming the eternal plan of God for redemption. This concept underscores God's sovereign grace, demonstrating that the plan of salvation was not a reaction to sin but a predetermined purpose. Throughout the Scriptures, we see a consistent narrative that prepares God's people for the coming of the Lamb, illustrated by the sacrificial system and prophecies like Isaiah 53, which portrays the suffering servant who would bear the iniquities of many. This aligns with God's character as one who knows and ordains all things for His glory and the salvation of His chosen people.