1 Jn 5:1, Jn 1:11-13, Rom 8:15-16, 2 Cor 6:17-18, Gal 3:26, Gal 4:5-7, Eph 1:5, 1 Jn 3:1-2

In the Old Testament, God decided to make the Israelites His children. (Jeremiah 3:19)

Jeremiah 3:19 But I said, How shall I put thee among the children, and give thee a pleasant land, a goodly heritage of the hosts of nations? and I said, Thou shalt call me, My father; and shalt not turn away from me.

Those who believe in Jesus as the Christ become children of God. (1 John 5:1, John 1:11-13, Romans 8:15-16, 2 Corinthians 6:17-18, Gal 3:26, Gal 4:5-7, Eph 1:5, 1 John 3:1-2 )

1 John 5:1 Whosoever believeth that Jesus is the Christ is born of God: and every one that loveth him that begat loveth him also that is begotten of him.

John 1:11-13 He came unto his own, and his own received him not. 12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: 13 Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.

Romans 8:15 15 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. 16 The Spirit itself beareth witness with our spirit, that we are the children of God:

2 Corinthians 6:17 Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you. 18 And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty.

Gal 3:26 For ye are all the children of God by faith in Christ Jesus.

Gal 4:5 o redeem them that were under the law, that we might receive the adoption of sons. 6 And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father. 7 Wherefore thou art no more a servant, but a son; and if a son, then an heir of God through Christ.

Eph 1:5 Having predestinated us unto the adoption of children by Jesus Christ to himself, according to the good pleasure of his will,

1 John 3:1 Behold, what manner of love the Father hath bestowed upon us, that we should be called the sons of God: therefore the world knoweth us not, because it knew him not. 2 Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.