Galatians 3:24

Wherefore the law was our schoolmaster unto Christ
So the words should be read, as they are by the Syriac and Ethiopic versions; for the words "to bring us" are a supplement of our translators, and have nothing to answer to them in the original; and the sense of the passage is, that the law performed this office of a schoolmaster until the coming of Christ; which shows that till that time the church was in its minority, that the Jews were but children in knowledge and understanding, and therefore stood in need, and were under the care of a schoolmaster, the law, by which the whole Mosaic administration is designed. They were taught by the moral law, the letter, the writing on the two tables, with other statutes and judgments, their duty to God and men, what is to be done and to be avoided, what is righteousness and what is not, the nature of sin, its demerit and consequences; but these gave them no instructions about a Saviour, and life and righteousness by him. The ceremonial law gave them some hints of the Gospel scheme, and the way of salvation by Christ, but in a manner suited to their estate of childhood; by sights and shows, by types and figures, by rites and ceremonies, by shadows and sacrifices; it taught them by divers washings the pollution of their nature, their need of the blood of Christ to cleanse from all sin; by circumcision, the necessity of regeneration, and the internal circumcision of the heart; by the passover, the daily sacrifice and other offerings, the doctrines of redemption, satisfaction, and atonement; and by the brazen serpent, the necessity of looking to Christ for life and salvation, and by various other things in that branch of the legal economy: but besides the instruction the law gave, it made use of discipline as a schoolmaster does; it kept a strict eye and hand over them, and them close to the performance of their duty; and restrained them from many things their inclinations led them to, threatening them with death in case of disobedience, and inflicting its penalties on delinquents; hence they that were under its discipline, were through fear of death it threatened them with, all their time subject to bondage: even the ceremonial law had something awful and tremendous in it; every beast that was slain in sacrifice was not only an instruction to them that they deserved to die as that creature did; but carried in it a tacit acknowledgment and confession of their own guilt; and the whole was an handwriting of ordinances against them. Moreover, the law being called a schoolmaster, shows that the use of it was but temporary, and its duration but for a time; children are not always to be under, nor designed to be always under a schoolmaster, no longer than till they are come to a proper age for greater business and higher exercises of life; so the law was to continue, and did continue, to be of this use and service to the Jewish church during its minority, until Christ came, the substance of all it taught and directed to: both the Jerusalem Targum and that of Jonathan ben Uzziel, on ( Numbers 11:12 ) use the very Greek word the apostle does here, concerning Moses, rendering the words, as a "pedagogue" or "schoolmaster" bears a sucking child into the land

That we might be justified by faith;
by Christ the object of faith, by his righteousness, which faith looks unto and receives, and not by the law and the works of it; the people of the Jews were in such a state under the law, and the law of that use unto them before the coming of Christ, as above represented, that it might be made manifest, be a clear point, and out of all dispute, that there is no such thing as justification by the law; for how could ever such a blessing be expected from it, when men were kept under it as under a military guard; when they were shut up in it as in a prison, and were treated by it as malefactors, convicted and condemned; and when they were under the discipline of it, as a rigid and severe schoolmaster? this being their case till Christ came, when it ceased to be all this to them, he being the end of it for righteousness, it became a thing self-evident, that justification is only by him and his righteousness, and so the end here mentioned was answered.