Consider Abraham: "He believed God, and it was credited to him as righteousness." Understand, then, that those who believe are children of Abraham. The Scripture foresaw that God would justify the Gentiles by faith, and announced the gospel in advance to Abraham: "All nations will be blessed through you." So those who have faith are blessed along with Abraham, the man of faith.
All who rely on observing the law are under a curse, for it is written: "Cursed is everyone who does not continue to do everything written in the Book of the Law."
Galatians 3:6-10 NIV