'Adoption' in the Bible

For ye have not received the spirit of bondage again to fear; but ye have received the Spirit of adoption, whereby we cry, Abba, Father.

And not only they, but ourselves also, which have the firstfruits of the Spirit, even we ourselves groan within ourselves, waiting for the adoption, to wit, the redemption of our body.

Who are Israelites; to whom pertaineth the adoption, and the glory, and the covenants, and the giving of the law, and the service of God, and the promises;

To redeem them that were under the law, that we might receive the adoption of sons.

Having predestinated us unto the adoption of children by Jesus Christ to himself, according to the good pleasure of his will,