'Adoption' in the Bible

For ye have not received a spirit of bondage again for fear, but ye have received a spirit of adoption, whereby we cry, Abba, Father.

And not only that, but even we ourselves, who have the first-fruits of the Spirit, we also ourselves groan in ourselves, awaiting adoption, that is the redemption of our body.

who are Israelites; whose is the adoption, and the glory, and the covenants, and the law-giving, and the service, and the promises;

having marked us out beforehand for adoption through Jesus Christ to himself, according to the good pleasure of his will,