Galatians 3:26-29 directly concludes that those in Christ are Abraham's seed and heirs according to the promise.

Galatians 3:29 restates that those in Christ are Abraham's offspring and heirs, reinforcing the faith-based sonship.

Romans 4:11-16 develops the same theme: Abraham's faith makes him father of all believers, not just the circumcised.

Romans 9:7 clarifies that Abraham's true children are those of the promise, not merely physical descendants.

Romans 9:8 states that children of the promise are regarded as Abraham's offspring, reinforcing faith-based sonship.

Luke 19:9 calls Zacchaeus a son of Abraham because of his faith and repentance — same concept of sonship by faith.

Romans 4:16 explicitly says Abraham is father of all who share his faith, reinforcing the basis of sonship by faith.

John 8:39 presents a different criterion for being Abraham's children—doing his works—contrasting with faith alone.