Galatians 3:8-9

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 nations will be blessed through you"
Genesis 12:3 "I will bless those who bless you, and whoever curses you I will curse; and all peoples on earth will be blessed through you."
Genesis 18:18 "Abraham will surely become a great and powerful nation, and all nations on earth will be blessed through him."
Genesis 22:18 "... and through your offspring all nations on earth will be blessed, because you have obeyed me."
Genesis 26:4 "I will make your descendants as numerous as the stars in the sky and will give them all these lands, and through your offspring all nations on earth will be blessed, ..."
Acts 3:25 "And you are heirs of the prophets and of the covenant God made with your fathers. He said to Abraham, 'Through your offspring all peoples on earth will be blessed.'"

so those who have faith are blessed
Galatians 3:7 Understand, then, that those who believe are children of Abraham.
Romans 4:16 Therefore, the promise comes by faith, so that it may be by grace and may be guaranteed to all Abraham's offspring--not only to those who are of the law but also to those who are of the faith of Abraham. He is the father of us all.

along with Abraham, the man of faith
Romans 4:18-22 Against all hope, Abraham in hope believed and so became the father of many nations, just as it had been said to him, "So shall your offspring be." Without weakening in his faith, he faced the fact that his body was as good as dead--since he was about a hundred years old--and that Sarah's womb was also dead. Yet he did not waver through unbelief regarding the promise of God, but was strengthened in his faith and gave glory to God, being fully persuaded that God had power to do what he had promised. This is why "it was credited to him as righteousness."

NOTES:
Scripture foresaw - 1 Timothy 5:18
Abraham, man of faith - Romans 4; Hebrews 11:8-19
Read Romans 8

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984 by International Bible Society. Used by permission. All rights reserved worldwide.