2 For the law of the Spirit of life in Christ Jesus has made me free from the law of sin and death. 3 For what the law could not do in that it was weak through the flesh, God did by sending His own Son in the likeness of sinful flesh, on account of sin: He condemned sin in the flesh, 4 that the righteous requirement of the law might be fulfilled in us who do not walk according to the flesh but according to the Spirit. (Romans 8:2–4, NKJV)
The “law of the Spirit of life in Christ Jesus” is “the law of God,” it is “the gospel of His Son” (Romans 7:25; 1:9). Life is in Christ Jesus, and the gospel is the “law of faith” by which we are justified (Romans 3:26-27). The law that gives life is set in contrast with “the law of sin and death” – the rule that sin causes death (v. 1; Romans 6:23). The Law of Moses identified sin but could not save sinners (Romans 3:20, 23; 7:10-12). The Son of God became flesh, lived without sin and condemned sin by His life and His death (Philippians 2:5-8; Roman 5:6-11). In Christ, spiritual life is granted to all who “walk according to the Spirit” (who live in and by the gospel, Romans 1:16-17; 5:1-2; 6:1-14). We are not sinners because we are humans, we are sinners because we commit sin (Romans 5:12). Now, by the gospel, we are saved from our sins and choose to serve righteousness instead of sin (Romans 6:15-18).