Galatians 3:29

3:29 And if you belong to Christ, then you are Abraham’s descendants, heirs according to the promise.

Romans 8:16-17

8:16 The Spirit himself bears witness to our spirit that we are God’s children. 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.