Galatians 3:7-9

They which are of faith, the same are the children of Abraham. Paul now states his great argument. Abraham's faith made him righteous; he is the spiritual father of believers. Those who believe upon Christ, the promised seed of Abraham, are the spiritual children of Abraham and the heirs of the promise. The scripture, foreseeing that God would justify the heathen through faith. Looking forward to the salvation of the heathen who believe on Christ.

Preached before the gospel unto Abraham. Announced it in anticipation, in a great Messianic promise.

In thee shall all nations be blessed. See Ge 12:3. Observe (1) that this promise is made to Abraham long before he was circumcised. (2) It is a promise of a blessing for the Gentile nations through him. (3) It is a promise of Christ, and hence the gospel in promise before the law existed.
So then they which be of faith are blessed with faithful Abraham. Then this promise embraces Gentile believers. They are blessed as believing Abraham was blessed. See Ga 3:6.
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