Romans 9:8
That is, it is not the children of the flesh who are children of God; but the children of the promise are counted as his posterity.
John 1:13
who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
Romans 4:11-16
and he received circumcision as a sign, a seal of the faith-righteousness which he had while he was in uncircumcision; in order that he might be the father of all who believe, even though they are uncircumcised; so that righteousness might be imputed to them.
Romans 8:14
For only those are sons of God who are led by God's Spirit.
Galatians 3:26-29
You are all sons of God through your faith in Jesus Christ.
Galatians 4:22-31
For it is written that Abraham had two sons, one by the slave woman and one by the free woman;
1 John 3:1-2
Behold what manner of love the Father has given us in allowing us to be called "Children of God!" And that is what we are. For this reason the world does not recognize us, because it did not know him.