Галатам 4:28

we--The oldest manuscripts and versions are divided between "we" and "ye." "We" better accords with Gal 4:26, "mother of us." children of promise--not children after the flesh, but through the promise (Gal 4:23, Gal 4:29, Gal 4:31). "We are" so, and ought to wish to continue so.

The apostle, in this chapter, is still carrying on the same general design as in the former - to recover these Christians from the impressions made upon them by the judaizing teachers, and to represent their weakness and folly in suffering themselves to be drawn away from the gospel doctrine of justification, and to be deprived of their freedom from the bondage of the law of Moses. For this purpose he makes use of various considerations; such as, I. The great excellence of the gospel state above the legal (Gal 4:1-7). II. The happy change that was made in them at their conversion (Gal 4:8-11). III. The affection they had had for him and his ministry (Gal 4:12-16). IV. The character of the false teachers by whom they had been perverted (Gal 4:17, Gal 4:18). V. The very tender affection he had for them (Gal 4:19, Gal 4:20). VI. The history of Isaac and Ishmael, by a comparison taken from which he illustrates the difference between such as rested in Christ and such as trusted in the law. And in all these, as he uses great plainness and faithfulness with them, so he expresses the tenderest concern for them.

4:28-31 Paul applies the allegory of Hagar and Sarah (4:21-27) to the situation in Galatia. Isaac represents those who are born through God’s promise (3:8) by the power of the Spirit (3:2-5; cp. Eph 1:13-14) and who trust in God for salvation through Christ by faith alone. Ishmael represents those who believe that human effort by keeping the law will make them acceptable to God (Gal 3:10-11). This identification would have been shocking to the Judaizers, who thought of themselves as the legitimate children of Abraham because of their insistence on law-keeping.