Why is Christ referred to as the plumb line in Amos?

In Amos 7:7-8, God uses the imagery of a plumb line to symbolize His standard for His people, and Christ fulfills this role as He embodies perfect righteousness. The plumb line represents the absolute standard against which our lives are measured; in Christ, we find our true alignment with God's expectations. Paul further affirms this in his teachings, emphasizing that we will be judged by our standing in Christ—His perfect righteousness credited to us (Philippians 3:9). This understanding of Christ as the plumb line not only assures believers of their righteous standing before God but also challenges them to live according to His design.