I. They must keep up an obedient veneration for the law of Moses (v. 4): Remember the law of Moses my servant, and observe to do according to it, even that law which I commanded unto him in Horeb, that fiery law which was intended for all Israel, with the statutes and judgments, not only the law of the ten commandments, but all the other appointments, ceremonial and judicial, then and there given. Observe here, 1. The honourable mention that is made of Moses, the first writer of the Old Testament, in Malachi, the last writer. God by him calls him Moses my servant; for the righteous shall be had in everlasting remembrance. See how the penmen of scripture, though they lived in several ages at a great distance from each other (it was above 1200 years from Moses to Malachi), all concurred in the same thing, and supported one another, being all actuated and guided by one and the same Spirit. 2. The honourable mention that is made of the law of Moses; it was what God himself commanded; he owns it for his law, and he commanded it for all Israel, as the municipal law of their kingdom. Thus will God magnify his law and make it honourable. Note, We are concerned to keep the law because God has commanded it and commanded it for us, for we are the spiritual Israel; and, if we expect the benefit of the covenant with Israel (Heb. viii. 10), we must observe the commands given to Israel, those of them that were intended to be of perpetual obligation. 3. The summary of our duty, with reference to the law. We must remember it. Forgetfulness of the law is at the bottom of all our transgressions of it; if we would rightly remember it, we could not but conform to it. We should remember it when we have occasion to use it, remember both the commands themselves and the sanctions wherewith they are enforced. The office of conscience is to bid us remember the law. But how does this charge to remember the law of Moses come in here? (1.) This prophet had reproved them for many gross corruptions and irregularities both in worship and conversation, and now, for the reforming and amending of what was amiss, he only charges them to remember the law of Moses: "Keep to that rule, and you will do all you should do." He will lay upon them no other burden than what they have received; hold that fast, Rev. ii. 24, 25. Note, Corrupt churches are to be reformed by the written word, and reduced into order by being reduced to the standard of the law and the testimony, see 1 Cor. xi. 23. (2.) The church had long enjoyed the benefit of prophets, extraordinary messengers from God, and now they had a whole book of their prophecies put together, and it was a finished piece; but they must not think that hereby the law of Moses was superseded, and had become as an almanac out of date, as if now they were advanced to a higher form and might forget that. No; the prophets do but confirm and apply the law, and press the observance of that; and therefore still Remember the law. Note, Even when we have made considerable advances in knowledge we must still retain the first principles of practical religion and resolve to abide by them. Those that study the writings of the prophets, and the apocalypse, must still remember the law of Moses and the four gospels. (3.) Prophecy was now to cease in the church for some ages, and the Spirit of prophecy not to return till the beginning of the gospel, and now they are told to remember the law of Moses; let them live by the rules of that, and live upon the promises of that. Note, We need not complain for want of visions and revelations as long as we have the written word, and the canon of scripture complete, to be our guide; for that is the most sure word of prophecy, and the touchstone by which we are to try the spirits. Though we have not prophets, yet, as long as we have Bibles, we may keep our communion with God, and keep ourselves in his way. (4.) They were to expect the coming of the Messiah, the preaching of his gospel, and the setting up of his kingdom, and in that expectation they must remember the law of Moses, and live in obedience to that, and then they might expect the comforts that the Messiah would bring to the willing and obedient. Let them observe the law of Moses, and live up to the light which that gave them, and then they might expect the benefit of the gospel of Christ, for to him that has, and uses what he has well, more shall be given, and he shall have abundance.