Romans 4:13

It was not through law that Abraham and his offspring received the promise that he would be heir of the world, but through the righteousness that comes by faith.

It was not through law that Abraham and his offspring received the promise
Acts 13:32-33a "We tell you the good news: What God promised our fathers he has fulfilled for us, their children, by raising up Jesus."
Galatians 3:16 The promises were spoken to Abraham and to his seed. The Scripture does not say "and to seeds," meaning many people, but "and to your seed," meaning one person, who is Christ.
Galatians 3:29 If you belong to Christ, then you are Abraham's seed, and heirs according to the promise.

that he would be heir of the world
Genesis 17:4-6 "As for me, this is my covenant with you: You will be the father of many nations. No longer will you be called Abram; your name will be Abraham, for I have made you a father of many nations. I will make you very fruitful; I will make nations of you, and kings will come from you."

but through the righteousness that comes by faith
Romans 9:30 What then shall we say? That the Gentiles, who did not pursue righteousness, have obtained it, a righteousness that is by faith; ...

NOTES:
Romans 4:11-12; Genesis 12:3, 7; 13:14-16; 15:7, 18-21; 17:8; 18:18; 22:18; Psalm 37:9, 11, 22, 29, 34; Matthew 5:5

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.