Revelation 5:1 – 14, 7:9 – 17
Ephesians 1:3–6 (NKJV)
3 Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ, 4 just as He chose us in Him before the foundation of the world, that we should be holy and without blame before Him in love, 5 having predestined us to adoption as sons by Jesus Christ to Himself, according to the good pleasure of His will, 6 to the praise of the glory of His grace, by which He made us accepted in the Beloved.
John 1:12 (NKJV)
12 But as many as received Him, to them He gave the right to become children of God, to those who believe in His name:
I The Holy Trinity in adopting believers in Christ to become children of the living God
Galatians 4:4–7 (NKJV)
4 But when the fullness of the time had come, God sent forth His Son, born of a woman, born under the law, 5 to redeem those who were under the law, that we might receive the adoption as sons. 6 And because you are sons, God has sent forth the Spirit of His Son into your hearts, crying out, “Abba, Father!” 7 Therefore you are no longer a slave but a son, and if a son, then an heir of God through Christ.
II Sonship and inheritance
Hebrews 12:6–7 (NKJV)
6 For whom the Lord loves He chastens, And scourges every son whom He receives.” 7 If you endure chastening, God deals with you as with sons; for what son is there whom a father does not chasten?
Psalm 16:5–6 (NKJV)
5 O Lord, You are the portion of my inheritance and my cup; You maintain my lot. 6 The lines have fallen to me in pleasant places; Yes, I have a good inheritance.
III The Spirit of sonship
Romans 8:15–17 (NKJV)
15 For you did not receive the spirit of bondage again to fear, but you received the Spirit of adoption by whom we cry out, “Abba, Father.” 16 The Spirit Himself bears witness with our spirit that we are children of God, 17 and if children, then heirs—heirs of God and joint heirs with Christ, if indeed we suffer with Him, that we may also be glorified together.
Westminster Larger Catechism
Q. 74. What is adoption?
A. Adoption is an act of the free grace of God, in and for his only Son Jesus Christ, whereby all those that are justified are received into the number of his children, have his name put upon them, the Spirit of his Son given to them. are under his fatherly care and dispensations, admitted to all the liberties and privileges of the sons of God, made heirs of all the promises, and fellow-heirs with Christ in glory.