Galatians 3:29; Galatians 4:1; Galatians 4:7

29 And if you belong to Christ, then you are Abraham's descendants, heirs according to promise.
1 Now I say, as long as the heir is a child, he does not differ at all from a slave although he is owner of everything,
7 Therefore you are no longer a slave, but a son; and if a son, then an heir through God.