2 Corinthians 6:18 “I will be a Father to you, and you shall be my son’s and daughters, says the LORD Almighty.”
In the book of Genesis, Jacob (who’s name was changed to Israel), became the father of 12 sons and a daughter. His 12 sons became the 12 tribes of Israel. They are listed here in order of birth:
The familiar story of Joseph, Israel’s favorite and unique child (Gen 37:3), tells how he became exhaulted over his brothers and elevated to the highest position in the land under the king. Joseph is an early type and foreshadowing of Christ.
In chapter 41 Joseph has two sons Ephraim and Mennaseh by his Egyptian wife. After Joseph’s family joined him in Egypt, his father Israel, blessed Ephraim and Mannaseh. But he did something peculiar. He didn’t just bless them as his grandchildren. His blessing was bestowed on them as though they were his own sons.
Genesis 48:5-6 And now your two sons, Ephraim and Manasseh, who were born to you in the land of Egypt before I came to you in Egypt, are mine; as Reuben and Simeon, they shall be mine. Your offspring whom you beget after them shall be yours; they will be called by the name of their brothers in their inheritance.
Notice how Israel spoke Ephraim and Manasseh compared to his first two sons. They will be just as important as the first born sons of Israel. Not only just as important, but Israel claims them as his own children.
In theology we have what is known as the doctrine of adoption. Jesus Christ being the firstborn of God (Colossians 1:15), those who are adopted by God through faith become sons of God or “co-heirs with Christ”.
Romans 8:14-17 “For as many as are led by the Spirit of God, these are sons of God. 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.” The Spirit Himself bears witness with our spirit that we are children of God, 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.”
Like Joseph’s children born of foreign land, we Gentiles were also born as foreigners of Israel. But, through Christ we have access to the Father, like Ephraim and Manasseh had through Joseph. As we read in Ephesians 5:1, “He predestined us to adoption as sons through Jesus Christ to Himself, according to the kind intention of His will.”
John 1:12 says “But as many as received Him, to them He gave the right to become children of God, even to those who believe in His name.”
Also read: 1 Chronicles 28:6, Hosea 2:23 (Romans 9:24-26), Romans 9:8, Galatians 3:7, 26, 29; Galatians 4:4-5, Ephesians 3:26