In these verses the apostle illustrates the difference between believers who rested in Christ only and those judaizers who trusted in the law, by a comparison taken from the story of Isaac and Ishmael. This he introduces in such a manner as was proper to strike and impress their minds, and to convince them of their great weakness in departing from the truth, and suffering themselves to be deprived of the liberty of the gospel: Tell me, says he, you that desire to be under the law, do you not hear the law? He takes it for granted that they did hear the law, for among the Jews it was wont to be read in their public assemblies every sabbath day; and, since they were so very fond of being under it, he would have them duly to consider what is written therein (referring to what is recorded Gen. 16 and 21), for, if they would do this, they might soon see how little reason they had to trust in it. And here, 1. He sets before them the history itself (Gal 4:22, Gal 4:23): For it is written, Abraham had two sons, etc. Here he represents the different state and condition of these two sons of Abraham - that the one, Ishmael, was by a bond-maid, and the other, Isaac, by a free-woman; and that whereas the former was born after the flesh, or by the ordinary course of nature, the other was by promise, when in the course of nature there was no reason to expect that Sarah should have a son. 2. He acquaints them with the meaning and design of this history, or the use which he intended to make of it (Gal 4:24-27): These things, says he, are an allegory, wherein, besides the literal and historical sense of the words, the Spirit of God might design to signify something further to us, and that was, That these two, Agar and Sarah, are the two covenants, or were intended to typify and prefigure the two different dispensations of the covenant. The former, Agar, represented that which was given from mount Sinai, and which gendereth to bondage, which, though it was a dispensation of grace, yet, in comparison of the gospel state, was a dispensation of bondage, and became more so to the Jews, through their mistake of the design of it, and expecting to be justified by the works of it. For this Agar is mount Sinai in Arabia (mount Sinai was then called Agar by the Arabians), and it answereth to Jerusalem which now is, and is in bondage with her children; that is, it justly represents the present state of the Jews, who, continuing in their infidelity and adhering to that covenant, are still in bondage with their children. But the other, Sarah, was intended to prefigure Jerusalem which is above, or the state of Christians under the new and better dispensation of the covenant, which is free both from the curse of the moral and the bondage of the ceremonial law, and is the mother of us all - a state into which all, both Jews and Gentiles, are admitted, upon their believing in Christ. And to this greater freedom and enlargement of the church under the gospel dispensation, which was typified by Sarah the mother of the promised seed, the apostle refers that of the prophet, Isa 54:1, where it is written, Rejoice, thou barren that bearest not; break forth and cry, thou that travailest not; for the desolate hath many more children than she who hath a husband. 3. He applies the history thus explained to the present case (Gal 4:28); Now we, brethren, says he, as Isaac was, are the children of the promise. We Christians, who have accepted Christ, and rely upon him, and look for justification and salvation by him alone, as hereby we become the spiritual, though we are not the natural, seed of Abraham, so we are entitled to the promised inheritance and interested in the blessings of it. But lest these Christians should be stumbled at the opposition they might meet with from the Jews, who were so tenacious of their law as to be ready to persecute those who would not submit to it, he tells them that this was no more than what was pointed to in the type; for as then he that was born after the flesh persecuted him that was born after the Spirit, they must expect it would be so now. But, for their comfort in this case, he desires them to consider what the scripture saith (Gen 21:10), Cast out the bond-woman and her son, for the son of the bond-woman shall not be heir with the son of the free-woman. Though the judaizers should persecute and hate them, yet the issue would be that Judaism would sink, and wither, and perish; but true Christianity should flourish and last for ever. And then, as a general inference from the whole of the sum of what he had said, he concludes (Gal 4:31), So then, brethren, we are not children of the bond-woman, but of the free.

Was born after the flesh - Ishmael was born according to the course of nature, his parents being both of a proper age, so that there was nothing uncommon or supernatural in his birth: this is the proper meaning of the apostle's κατα σαρκα, after or according to the flesh, and answers to the Hebrew phrase, על דרך בשר al derec basar, according to the manner of the flesh, i.e. naturally, according to the common process of nature.

By promise - Both Abraham and Sarah had passed that age in which the procreation of children was possible on natural principles. The birth, therefore, of Isaac was supernatural; it was the effect of an especial promise of God; and it was only on the ground of that promise that it was either credible or possible.

Which things are an allegory,.... Or "are allegorized": so Sarah and Hagar were allegorized by Philo the Jew (p), before they were by the apostle. Sarah he makes to signify virtue, and Hagar the whole circle of arts and sciences, which are, or should be, an handmaid to virtue; but these things respecting Hagar and Sarah, the bondwoman and the free, and their several offspring, are much better allegorized by the apostle here. An allegory is a way of speaking in which one thing is expressed by another, and is a continued metaphor; and the apostle's meaning is, that these things point at some other things; have another meaning in them, a mystical and spiritual one, besides the literal; and which the Jews call

"Midrash", a name they give to the mystical and allegorical sense of Scripture, in which they greatly indulge themselves. An allegory is properly a fictitious way of speaking; but here it designs an accommodation of a real history, and matter of fact, to other cases and things, and seems to intend a type or figure; and the sense to be, that these things which were literally true of Hagar and Sarah, of Ishmael and Isaac, were types and figures of things to come; just as what befell the Israelites were types and figures of things that would be under the Gospel dispensation, Co1 10:11.

for these are the two covenants, or "testaments"; that is, these women, Hagar and Sarah, signify, and are figures of the two covenants; not the covenant of works, and the covenant of grace. Hagar was no figure of the covenant of works, that was made and broke before she was born; besides, the covenant she was a figure of was made at Mount Sinai, whereas the covenant of works was made in paradise: moreover, the covenant of works was made with Adam, and all his posterity, but the covenant which Hagar signified was only made with the children of Israel; she represented Jerusalem, that then was with her children. Nor was Sarah a figure of the covenant of grace, for this was made long before she had a being, even from everlasting; but they were figures of the two administrations of one and the same covenant, which were to take place in the world successively; and which following one the other, are by the author of the Epistle to the Hebrews called the first and the second, the old and the new covenants. Now these are the covenants or testaments, the old and the new, and the respective people under them, which were prefigured by these two women, and their offspring.

The one from the Mount Sinai; that is, one of these covenants, or one of the administrations of the covenant, one dispensation of it, which is the first, and now called old, because abolished, took its rise from Mount Sinai, was delivered there by God to Moses, in order to be communicated to the people of Israel, who were to be under that form of administration until the coming of the Messiah. And because the whole Mosaic economy was given to Moses on Mount Sinai, it is said to be from thence: hence, in Jewish writings, we read, times without number, of , a rite, custom, constitution, or appointment given to Moses "from Mount Sinai", the same phrase as here. Sinai signifies "bushes", and has its name from the bushes which grew upon if, (q); in one of which the Lord appeared to Moses; for Horeb and Sinai are one and the same mount; one signifies waste and desolate, the other bushy; as one part of the mountain was barren and desert, and the other covered with bushes and brambles; and may fitly represent the condition of such that are under the law.

Which gendereth to bondage; begets and brings persons into a state of bondage, induces on them a spirit of bondage to fear, and causes them to be all their lifetime subject to it; as even such were that were under the first covenant, or under the Old Testament dispensation:

which is Agar; or this is the covenant, the administration of it, which Hagar, the bondwoman, Sarah's servant, represented.

(p) De Cherubim, p. 108, 109. (q) Pirke Eliezer, c. 41.

after the flesh--born according to the usual course of nature: in contrast to Isaac, who was born "by virtue of the promise" (so the Greek), as the efficient cause of Sarah's becoming pregnant out of the course of nature (Rom 4:19). Abraham was to lay aside all confidence in the flesh (after which Ishmael was born), and to live by faith alone in the promise (according to which Isaac was miraculously born, contrary to all calculations of flesh and blood).