What does the Bible say about adoption as sons?

In Galatians 4:4-5, Paul emphasizes that God sent His Son to redeem those under the law so that we might receive the adoption as sons. This adoption is not merely a change in status but a profound transformation in relationship with God as our Father. It is grounded in the redemptive work of Christ—His life, death, and resurrection—secured for all whom He died. As believers, we are granted this privilege of sonship, not based on our merit but by God's grace, realized at His appointed time.