22 Abraham, remember, had two sons: one by the slave woman and one by the free woman. 23 The son of the slave woman was born by human connivance; the son of the free woman was born by God's promise. 24 This illustrates the very thing we are dealing with now. The two births represent two ways of being in relationship with God. One is from Mount Sinai in Arabia. 25 It corresponds with what is now going on in Jerusalem - a slave life, producing slaves as offspring. This is the way of Hagar. 26 In contrast to that, there is an invisible Jerusalem, a free Jerusalem, and she is our mother - this is the way of Sarah. 27 Remember what Isaiah wrote: Rejoice, barren woman who bears no children, shout and cry out, woman who has no birth pangs, Because the children of the barren woman now surpass the children of the chosen woman. 28 Isn't it clear, friends, that you, like Isaac, are children of promise? 29 In the days of Hagar and Sarah, the child who came from faithless connivance (Ishmael) harassed the child who came - empowered by the Spirit - from the faithful promise (Isaac). Isn't it clear that the harassment you are now experiencing from the Jerusalem heretics follows that old pattern? 30 There is a Scripture that tells us what to do: "Expel the slave mother with her son, for the slave son will not inherit with the free son." 31 Isn't that conclusive? We are not children of the slave woman, but of the free woman.
Matthew Henry's Commentary on Galatians 4:22-31
Commentary on Galatians 4:21-27
(Read Galatians 4:21-27)
The difference between believers who rested in Christ only, and those who trusted in the law, is explained by the histories of Isaac and Ishmael. These things are an allegory, wherein, beside the literal and historical sense of the words, the Spirit of God points out something further. Hagar and Sarah were apt emblems of the two different dispensations of the covenant. The heavenly Jerusalem, the true church from above, represented by Sarah, is in a state of freedom, and is the mother of all believers, who are born of the Holy Spirit. They were by regeneration and true faith, made a part of the true seed of Abraham, according to the promise made to him.
Commentary on Galatians 4:28-31
(Read Galatians 4:28-31)
The history thus explained is applied. So then, brethren, we are not children of the bond-woman, but of the free. If the privileges of all believers were so great, according to the new covenant, how absurd for the Gentile converts to be under that law, which could not deliver the unbelieving Jews from bondage or condemnation! We should not have found out this allegory in the history of Sarah and Hagar, if it had not been shown to us, yet we cannot doubt it was intended by the Holy Spirit. It is an explanation of the subject, not an argument in proof of it. The two covenants of works and grace, and legal and evangelical professors, are shadowed forth. Works and fruits brought forth in a man's own strength, are legal. But if arising from faith in Christ, they are evangelical. The first covenant spirit is of bondage unto sin and death. The second covenant spirit is of liberty and freedom; not liberty to sin, but in and unto duty. The first is a spirit of persecution; the second is a spirit of love. Let those professors look to it, who have a violent, harsh, imposing spirit, towards the people of God. Yet as Abraham turned aside to Hagar, so it is possible a believer may turn aside in some things to the covenant of works, when through unbelief and neglect of the promise he acts according to the law, in his own strength; or in a way of violence, not of love, towards the brethren. Yet it is not his way, not his spirit to do so; hence he is never at rest, till he returns to his dependence on Christ again. Let us rest our souls on the Scriptures, and by a gospel hope and cheerful obedience, show that our conversation and treasure are indeed in heaven.