7 Therefore know that only those who are of faith are sons of Abraham. 8 And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel to Abraham beforehand, saying, “In you all the nations shall be blessed.” 9 So then those who are of faith are blessed with believing Abraham. (Galatians 3:7–9, NKJV)
Keeping the law of Moses cannot save anyone from sin; it identifies one as a sinner (Gal. 3:10-12; Rom. 3:23). Salvation from sin comes “by the hearing of faith,” that is, by the gospel of Christ (Gal. 3:2, 5). Sinners hear that salvation comes by faith through the gospel, not through the law of Moses and its works. One’s faith is counted for righteousness by hearing, believing, and obeying the truth of the gospel of Christ (Gal. 3:1-2, 5-6). Before the law of Moses existed, gospel salvation “by the hearing of faith” was preached in the promise to Abraham: “In you all the nations shall be blessed” (3:8). This promised blessing is available in Christ. The gospel reveals the crucified Christ so we can receive the blessings of Abraham (Gal. 3:1, 13-14). The “blessing of Abraham” and “the promise of the Spirit through faith” is the salvation from sins preached to Abraham, fulfilled by Christ’s death, and heard in the gospel (Gal. 3:14, 2, 22-25). Every sinner who believes the gospel and obeys the truth is saved from sins, is a child of God, and an heir of the promise (Gal. 3:26-29). We preach the gospel of Christ so sinners can believe and obey the truth and be saved in Christ (Gal. 3:26-27).