Galatians 4:3-7

So we also, when we were children, were held in bondage under the rudiments of the world: but when the fulness of the time came, God sent forth his Son, born of a woman, born under the law, that he might redeem them that were under the law, that we might receive the adoption of sons. And because ye are sons, God sent forth the Spirit of his Son into our hearts, crying, Abba, Father. So that thou art no longer a bondservant, but a son; and if a son, then an heir through God.