Romans 9:8
In other words, it is not the children by natural descent who count as God's children, but the children made such by the promise are regarded as Abraham's posterity.
John 1:13
who were begotten as such not by human descent, nor through an impulse of their own nature, nor through the will of a human father, but from God.
Romans 4:11-16
Before, not after. And he received circumcision as a sign, a mark attesting the reality of the faith-righteousness which was his while still uncircumcised, that he might be the forefather of all those who believe even though they are uncircumcised--in order that this righteousness might be placed to their credit;
Romans 8:14
For those who are led by God's Spirit are, all of them, God's sons.
Galatians 3:26-29
You are all sons of God through faith in Christ Jesus;
Galatians 4:22-31
For it is written that Abraham had two sons, one by the slave-girl and one by the free woman.
1 John 3:1-2
See what marvellous love the Father has bestowed upon us--that we should be called God's children: and that is what we are. For this reason the world does not recognize us--because it has not known Him.