Tell me, you who desire to be under the law, do you not hear the law? 22 For it is written that Abraham had two sons: the one by a bondwoman, the other by a freewoman. 23 But he who was of the bondwoman was born according to the flesh, and he of the freewoman through promise, 24 which things are symbolic. For these are the two covenants: the one from Mount Sinai which gives birth to bondage, which is Hagar— 25 for this Hagar is Mount Sinai in Arabia, and corresponds to Jerusalem which now is, and is in bondage with her children— 26 but the Jerusalem above is free, which is the mother of us all. (Gal 4:21-26, emphases added)
That is, those who are the children of the flesh, these are not the children of God; but the children of the promise are counted as the seed. (Rom 9:8, emphasis added)
Now we, brethren, as Isaac was, are children of promise. (Gal 4:28)
Children of the Promise is another way of saying “children of God.” (see Rom 9:8 above) But what, exactly, is the significance of this for us who have accepted Jesus Christ as our Savior?
One thing to note is that the Bible says that we become children of the promise when we’re baptized into Christ through water baptism.
Then Peter said to them, “Repent, and let every one of you be baptized in the name of Jesus Christ for the remission of sins; and you shall receive the gift of the Holy Spirit. For the promise is to you and to your children, and to all who are afar off, as many as the Lord our God will call.” (Act 2:38-39)
This teaching is verified in Ephesians 3:
. . . that the Gentiles should be fellow heirs, of the same body, and partakers of His promise in Christ through the gospel . . . (Eph 3:6)
Upon our acceptance of Jesus Christ as Savior and our water baptism into Christ, we become Children of Promise—children of God! Hallelujah!
For you are all sons [children] of God through faith in Christ Jesus. 27 For as many of you as were baptized into Christ have put on Christ. 28 There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus. 29 And if you are Christ’s, then you are Abraham’s seed, and heirs according to the promise. (Gal 3:26-29, explanatory word inserted)
Being Children of the Promise means that we are heirs of God and joint heirs with Jesus Christ! Glory to God! (Rom 8:17)
This means that we are entitled to all of the blessings that Jesus earned for Himself by living a sinless, perfect life in loving obedience to His Father while He lived on earth. In accepting Christ as Savior and being baptized into Him through water baptism, we become qualified to receive this vast and rich inheritance! Rejoice, O children of promise!