Romans 9:8
9:8 This means it is not the children of the flesh who are the children of God; rather, the children of promise are counted as descendants.
Romans 8:16
8:16 The Spirit himself bears witness to our spirit that we are God’s children.
Romans 9:7
9:7 nor are all the children Abraham’s true descendants; rather “through Isaac will your descendants be counted.”
Romans 8:17
8:17 And if children, then heirs (namely, heirs of God and also fellow heirs with Christ) – if indeed we suffer with him so we may also be glorified with him.
Romans 8:21
8:21 that the creation itself will also be set free from the bondage of decay into the glorious freedom of God’s children.